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Unit9

The document discusses the sexagesimal system for measuring angles and time. It explains that angles are measured in degrees, minutes, and seconds, with one degree equal to 60 minutes and one minute equal to 60 seconds. Similarly, time is measured in hours, minutes, and seconds, with one hour equal to 60 minutes and one minute equal to 60 seconds. Examples are provided to illustrate how to write angles and time measurements using this sexagesimal numeral system.

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Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Angles and Lines Matem´ticas 1o E.S.O. a -
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises 1 Lines 2 Perpendicular bisector of a segment and bisector of an angle 3 Sexagesimal system and angles 4 Sexagesimal system and time 5 Adding and Subtracting in the sexagesimal system 6 Exercises Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Plane Geometry Plane Geometry deals with figures in a plane (circles, lines, polygons. . . ) A line is a set of points extending in two opposite directions without end, It’s a straight one-dimensional figure with no thickness and extending infinitely in both directions. A line is sometimes called a straight line. Points are said to be collinear points if they lie on a single straight line. A plane is a flat surface that has no thickness and extends without ending in ALL directions. Points are said to be coplanar points if they lie on a common plane. A line segment is a finite portion of an infinite line. A line segment always has a beginning and an end. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Plane Geometry Plane Geometry deals with figures in a plane (circles, lines, polygons. . . ) A line is a set of points extending in two opposite directions without end, It’s a straight one-dimensional figure with no thickness and extending infinitely in both directions. A line is sometimes called a straight line. Points are said to be collinear points if they lie on a single straight line. A plane is a flat surface that has no thickness and extends without ending in ALL directions. Points are said to be coplanar points if they lie on a common plane. A line segment is a finite portion of an infinite line. A line segment always has a beginning and an end. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Perpendicular bisector of a segment and bisector of an angle Lines that intersect in a point are called intersecting lines. Lines that do not intersect are called parallel lines (in the plane). Two lines that lie on top of one another are called coincident lines. Two lines or line segments which are perpendicular are said to be orthogonal (two lines are said to be perpendicular if they meet at a 90o angle). Given two intersecting lines, the point of intersection is called the vertex and the amount of rotation about the vertex required to bring one line into correspondence with the other is called the angle between them. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines One full rotation corresponds to 360 degrees. Half a full rotation is called a straight angle, and a quarter of a full rotation is called a right angle. An angle less than a right angle is called an acute angle, an angle greater than a right angle (but less than a straight angle) is called an obtuse angle, and an angle greater than a straight angle (but less than a full angle) is called a reflex angle. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Bisector of a line segment A perpendicular bisector of a line segment AB is a line perpendicular to AB and passing through the midpoint M of AB. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Bisector of an angle The bisector of an angle is the line that divides the angle into two equal parts. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles The size of an angle There are several ways to measure the size of an angle, for example using units of degrees: In a complete circle there are three hundred and sixty degrees. You can express angles to any precision using decimal numbers. Example: 30 degrees and a half is 30.5 degrees. There is another way to state the size of an angle, subdividing a degree. The degree is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles The size of an angle There are several ways to measure the size of an angle, for example using units of degrees: In a complete circle there are three hundred and sixty degrees. You can express angles to any precision using decimal numbers. Example: 30 degrees and a half is 30.5 degrees. There is another way to state the size of an angle, subdividing a degree. The degree is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles: Degrees, minutes and seconds In a full circle there are 360 degrees, each degree is split up into 60 parts called minutes (each part being 1/60 of a degree), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 40 degrees, 20 minutes and 50 seconds is usually written this way: 40o 20 50 . Example: 30.5 degrees is 30o and 30 , because 0.5 degrees are 0.5 · 60 = 30 minutes. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles: Degrees, minutes and seconds In a full circle there are 360 degrees, each degree is split up into 60 parts called minutes (each part being 1/60 of a degree), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 40 degrees, 20 minutes and 50 seconds is usually written this way: 40o 20 50 . Example: 30.5 degrees is 30o and 30 , because 0.5 degrees are 0.5 · 60 = 30 minutes. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 1 Find five objects in your classroom that have right angles: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 1 Find five objects in your classroom that have right angles: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 2 Using the set square, draw an angle of a)45o b)30o c)105o d)15o Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 2 45o 30o 105o 15o Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 3 For each angle below, state whether the angle is acute, obtuse or reflex: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 3 For each angle below, state whether the angle is acute, obtuse or reflex: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 4 Measure the following angles: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 4 Measure the following angles: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : 2 5o 17 30 : 3 3 hr 14 min 18 sec: 4 15 hr 56 min 24 sec: Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 = 2 55o 44 52 + 24o 53 34 = 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec = 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec = Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 = 2 53o 24 12 − 32o 43 44 = 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec = 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec = Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
Indice Lines Bisectors Sexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines

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Unit9

  • 1.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Angles and Lines Matem´ticas 1o E.S.O. a -
  • 2.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises 1 Lines 2 Perpendicular bisector of a segment and bisector of an angle 3 Sexagesimal system and angles 4 Sexagesimal system and time 5 Adding and Subtracting in the sexagesimal system 6 Exercises Angles and Lines
  • 3.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Angles and Lines
  • 4.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Plane Geometry Plane Geometry deals with figures in a plane (circles, lines, polygons. . . ) A line is a set of points extending in two opposite directions without end, It’s a straight one-dimensional figure with no thickness and extending infinitely in both directions. A line is sometimes called a straight line. Points are said to be collinear points if they lie on a single straight line. A plane is a flat surface that has no thickness and extends without ending in ALL directions. Points are said to be coplanar points if they lie on a common plane. A line segment is a finite portion of an infinite line. A line segment always has a beginning and an end. Angles and Lines
  • 5.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Plane Geometry Plane Geometry deals with figures in a plane (circles, lines, polygons. . . ) A line is a set of points extending in two opposite directions without end, It’s a straight one-dimensional figure with no thickness and extending infinitely in both directions. A line is sometimes called a straight line. Points are said to be collinear points if they lie on a single straight line. A plane is a flat surface that has no thickness and extends without ending in ALL directions. Points are said to be coplanar points if they lie on a common plane. A line segment is a finite portion of an infinite line. A line segment always has a beginning and an end. Angles and Lines
  • 6.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines Perpendicular bisector of a segment and bisector of an angle Lines that intersect in a point are called intersecting lines. Lines that do not intersect are called parallel lines (in the plane). Two lines that lie on top of one another are called coincident lines. Two lines or line segments which are perpendicular are said to be orthogonal (two lines are said to be perpendicular if they meet at a 90o angle). Given two intersecting lines, the point of intersection is called the vertex and the amount of rotation about the vertex required to bring one line into correspondence with the other is called the angle between them. Angles and Lines
  • 7.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Lines One full rotation corresponds to 360 degrees. Half a full rotation is called a straight angle, and a quarter of a full rotation is called a right angle. An angle less than a right angle is called an acute angle, an angle greater than a right angle (but less than a straight angle) is called an obtuse angle, and an angle greater than a straight angle (but less than a full angle) is called a reflex angle. Angles and Lines
  • 8.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Angles and Lines
  • 9.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Bisector of a line segment A perpendicular bisector of a line segment AB is a line perpendicular to AB and passing through the midpoint M of AB. Angles and Lines
  • 10.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Perpendicular bisector of a segment and bisector of an angle Bisector of an angle The bisector of an angle is the line that divides the angle into two equal parts. Angles and Lines
  • 11.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles and Lines
  • 12.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles The size of an angle There are several ways to measure the size of an angle, for example using units of degrees: In a complete circle there are three hundred and sixty degrees. You can express angles to any precision using decimal numbers. Example: 30 degrees and a half is 30.5 degrees. There is another way to state the size of an angle, subdividing a degree. The degree is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. Angles and Lines
  • 13.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles The size of an angle There are several ways to measure the size of an angle, for example using units of degrees: In a complete circle there are three hundred and sixty degrees. You can express angles to any precision using decimal numbers. Example: 30 degrees and a half is 30.5 degrees. There is another way to state the size of an angle, subdividing a degree. The degree is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. Angles and Lines
  • 14.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles: Degrees, minutes and seconds In a full circle there are 360 degrees, each degree is split up into 60 parts called minutes (each part being 1/60 of a degree), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 40 degrees, 20 minutes and 50 seconds is usually written this way: 40o 20 50 . Example: 30.5 degrees is 30o and 30 , because 0.5 degrees are 0.5 · 60 = 30 minutes. Angles and Lines
  • 15.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and angles Angles: Degrees, minutes and seconds In a full circle there are 360 degrees, each degree is split up into 60 parts called minutes (each part being 1/60 of a degree), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 40 degrees, 20 minutes and 50 seconds is usually written this way: 40o 20 50 . Example: 30.5 degrees is 30o and 30 , because 0.5 degrees are 0.5 · 60 = 30 minutes. Angles and Lines
  • 16.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Angles and Lines
  • 17.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
  • 18.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
  • 19.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Sexagesimal system and time Time: Hours, minutes and seconds To measure time we can use hours: In a day there are twenty-four hours. You can express time to any precision using decimal numbers. Example: 3 hours and a quarter is 3.25 hours. There is another way to state the amount of time, subdividing an hour. The hour is divided into sixty parts called minutes. These minutes are further divided into sixty parts called seconds. In a day there are 24 hours, each hour is split up into 60 parts called minutes (each part being 1/60 of an hour), each minute is split up into 60 parts called seconds (each part being 1/60 of a minute). Example: 14 hours, 56 minutes and 12 seconds is usually written this way: 14 hr 56 min 12 sec. Example: 3.25 hours is 3 hr and 15 min, because 0.25 hours are 0.25 · 60 = 15 minutes. Angles and Lines
  • 20.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Angles and Lines
  • 21.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
  • 22.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
  • 23.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
  • 24.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Add in the sexagesimal system You must add or subtract the units separately. But you may need to do some adjusting if the hours end up 24 or more, the minutes end up 60 or more, the seconds end up 60 or more,or less than zero. Adding Add the hours. If the hours are 24 or more, subtract 24 from the hours and add 1 to the days. Add the minutes. If the minutes are 60 or more, subtract 60 from the hours and add 1 to the hours. And so on. Example: 40o 20 50 + 10o 33 6 = 50o 55 56 . Example: 14 hr 20 min 50 sec + 15 hr 43 min 26 sec =29 hr 63 min 76 sec =1 day 6 hr 4 min 16 sec. Angles and Lines
  • 25.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
  • 26.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
  • 27.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
  • 28.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
  • 29.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Adding and Subtracting in the sexagesimal system Subtract in the sexagesimal system Subtracting Subtract the hours. If the hours are negative, add 24 to the hours and subtract 1 from days. Subtract the minutes. If the minutes are negative, add 60 to the minutes and subtract 1 from hours. And so on. Example: 23 hr 40 min 51 sec − 15 hr 33 min 21 sec = 8 hr 7 min 30 sec. Example: 45o 33 12 −11o 42 20 =44o 92 72 −11o 42 20 =33o 50 52 . Angles and Lines
  • 30.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Angles and Lines
  • 31.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 1 Find five objects in your classroom that have right angles: Angles and Lines
  • 32.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 1 Find five objects in your classroom that have right angles: Angles and Lines
  • 33.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 2 Using the set square, draw an angle of a)45o b)30o c)105o d)15o Angles and Lines
  • 34.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 2 45o 30o 105o 15o Angles and Lines
  • 35.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 3 For each angle below, state whether the angle is acute, obtuse or reflex: Angles and Lines
  • 36.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 3 For each angle below, state whether the angle is acute, obtuse or reflex: Angles and Lines
  • 37.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 4 Measure the following angles: Angles and Lines
  • 38.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 4 Measure the following angles: Angles and Lines
  • 39.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : 2 5o 17 30 : 3 3 hr 14 min 18 sec: 4 15 hr 56 min 24 sec: Angles and Lines
  • 40.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
  • 41.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
  • 42.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
  • 43.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
  • 44.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 6 Write down the following amounts: 1 43o 34 25 : forty degrees, twenty minutes and fifty seconds. 2 5o 17 30 : five degrees, seventeen minutes and thirty seconds. 3 3 hr 14 min 18 sec: three hours, fourteen minutes and eighteen seconds. 4 15 hr 56 min 24 sec: fifteen hours, fifty-eight minutes and twenty-four seconds. Angles and Lines
  • 45.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 = 2 55o 44 52 + 24o 53 34 = 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec = 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec = Angles and Lines
  • 46.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
  • 47.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
  • 48.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
  • 49.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
  • 50.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 7 Find: 1 34o 14 15 + 11o 13 15 =45o 27 30 2 55o 44 52 + 24o 53 34 =80o 38 26 3 3 hr 34 min 17 sec + 4 hr 11 min 34 sec =7 hr 45 min 51 sec 4 18 hr 34 min 37 sec + 12 hr 26 min 34 sec =1 day 7 hr 1 min 11 sec Angles and Lines
  • 51.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 = 2 53o 24 12 − 32o 43 44 = 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec = 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec = Angles and Lines
  • 52.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
  • 53.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
  • 54.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
  • 55.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
  • 56.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 8 Find: 1 45o 21 45 − 33o 12 15 =12o 9 30 2 53o 24 12 − 32o 43 44 =20o 40 26 3 6 hr 24 min 15 sec − 4 hr 1 min 5 sec =2 hr 23 min 10sec 4 8 hr 24 min 13 sec − 5 hr 25 min 36 sec =2 hr 58 min 37sec Angles and Lines
  • 57.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Angles and Lines
  • 58.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
  • 59.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
  • 60.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
  • 61.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 9 Luis is a marathon runner. He trains two days: on the first day he runs the marathon in 2 hr 48 min 35 sec; and on the second day he runs it in 2 hr 45 min 30 sec. How long does Luis run over the two days in total? Data: First day: 2 hr 48 min 35 sec Second day: 2 hr 45 min 30 sec 2 hr 48 min 35 sec + 2 hr 45 min 30 sec Answer: Luis runs 5 hr 34 min 5 sec 5 hr 34 min 5 sec in total. Angles and Lines
  • 62.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Angles and Lines
  • 63.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
  • 64.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
  • 65.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines
  • 66.
    Indice Lines BisectorsSexagesimal system and angles Sexagesimal system and time Adding and Subtracting Exercises Exercises Exercise 10 Ana spent 7 hr 20 min 28 sec on painting a room in the weekend. She worked the same amount of time each day. How much time did she work each day? Data: She Ana spent 7 hr 20 min 28 sec 1 hr 40 min 14 sec + 1 hr 40 min 14 sec Answer: She worked 3 hr 20 min 28 sec 1 hr 40 min 14 sec a day. Angles and Lines