Your SlideShare is downloading. ×
  • Like
Angle Measure (Geometry 3_2)
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Now you can save presentations on your phone or tablet

Available for both IPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Angle Measure (Geometry 3_2)

  • 30,308 views
Published

Students learn to measure and classify angles.

Students learn to measure and classify angles.

Published in Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
  • hi rfant, came across your slides in a google search. I didn't know this site existed. I'll be back with some geometry and algebra stuff of my own. thx
    Are you sure you want to
    Your message goes here
  • You're welcome.

    May I suggest you take a look at:
    http://www.mathopenref.com

    Fantastic site for geometry.
    Are you sure you want to
    Your message goes here
No Downloads

Views

Total Views
30,308
On SlideShare
0
From Embeds
0
Number of Embeds
4

Actions

Shares
Downloads
618
Comments
2
Likes
11

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. You will learn to measure, draw, and classify angles. What You'll Learn 1) Degrees 2) Protractor 3) Right Angle 4) Acute Angle 5) Obtuse Angle Angle Measure Vocabulary
  • 2. In geometry, angles are measured in units called _______. degrees Angle Measure
  • 3. In geometry, angles are measured in units called _______. degrees The symbol for degree is ° . Angle Measure
  • 4. In geometry, angles are measured in units called _______. degrees The symbol for degree is ° . In the figure to the right, the angle is 75 degrees. In notation , there is no degree symbol with 75 because the measure of an angle is a real number with no unit of measure. Angle Measure Q P R 75 ° m PQR = 75
  • 5. Angle Measure For every angle, there is a unique positive number between __ and ____ called the degree measure of the angle. Postulate 3-1 Angles Measure Postulate B A C n °
  • 6. 0 Angle Measure For every angle, there is a unique positive number between __ and ____ called the degree measure of the angle. Postulate 3-1 Angles Measure Postulate B A C n °
  • 7. 0 180 Angle Measure For every angle, there is a unique positive number between __ and ____ called the degree measure of the angle. Postulate 3-1 Angles Measure Postulate B A C n °
  • 8. 0 180 Angle Measure For every angle, there is a unique positive number between __ and ____ called the degree measure of the angle. Postulate 3-1 Angles Measure Postulate B A C n ° m ABC = n and 0 < n < 180
  • 9. Find the measurement of: Angle Measure J H G S Q R m SRQ = m S RJ = m SRG = m QRG = m GRJ = m SRH
  • 10. Find the measurement of: 180 45 150 70 180 – 150 = 30 150 – 45 = 105 Angle Measure J H G S Q R m SRQ = m S RJ = m SRG = m QRG = m GRJ = m SRH
  • 11. Use a protractor to draw an angle having a measure of 135. Angle Measure
  • 12. Use a protractor to draw an angle having a measure of 135. Angle Measure 1) Draw AB A B
  • 13. Use a protractor to draw an angle having a measure of 135. 2) Place the center point of the protractor on A. Align the mark labeled 0 with the ray. Angle Measure 1) Draw AB A B
  • 14. Use a protractor to draw an angle having a measure of 135. 2) Place the center point of the protractor on A. Align the mark labeled 0 with the ray. Angle Measure 1) Draw AB 3) Locate and draw point C at the mark labeled 135. Draw AC. A B
  • 15. Use a protractor to draw an angle having a measure of 135. 2) Place the center point of the protractor on A. Align the mark labeled 0 with the ray. Angle Measure 1) Draw AB 3) Locate and draw point C at the mark labeled 135. Draw AC. C A B
  • 16. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure
  • 17. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles A
  • 18. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles obtuse angle 90 < m A < 180 A
  • 19. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles A obtuse angle 90 < m A < 180 A
  • 20. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles A right angle m A = 90 obtuse angle 90 < m A < 180 A
  • 21. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles A right angle m A = 90 A obtuse angle 90 < m A < 180 A
  • 22. Once the measure of an angle is known, the angle can be classified as one of three types of angles. These types are defined in relation to a right angle. Angle Measure Types of Angles A right angle m A = 90 acute angle 0 < m A < 90 A obtuse angle 90 < m A < 180 A
  • 23. Classify each angle as acute , obtuse , or right . Angle Measure 110 ° 90 ° 40 ° 50 ° 130 ° 75 °
  • 24. Classify each angle as acute , obtuse , or right . Obtuse Obtuse Acute Acute Acute Right Angle Measure 110 ° 90 ° 40 ° 50 ° 130 ° 75 °
  • 25. Angle Measure 5x - 7 B The measure of B is 138. Solve for x.
  • 26. Given: (What do you know?) Angle Measure 5x - 7 B The measure of B is 138. Solve for x. B = 5x – 7 and B = 138
  • 27. Given: (What do you know?) 5x – 7 = 138 5x = 145 x = 29 Angle Measure 5x - 7 B The measure of B is 138. Solve for x. B = 5x – 7 and B = 138
  • 28. Given: (What do you know?) 5x – 7 = 138 5x = 145 x = 29 5(29) -7 = ? 145 -7 = ? 138 = 138 Check! Angle Measure 5x - 7 B The measure of B is 138. Solve for x. B = 5x – 7 and B = 138
  • 29. Angle Measure 9y + 4 H The measure of H is 67. Solve for y.
  • 30. Given: (What do you know?) Angle Measure 9y + 4 H The measure of H is 67. Solve for y. H = 9y + 4 and H = 67
  • 31. Given: (What do you know?) 9y + 4 = 67 9y = 63 y = 7 Angle Measure 9y + 4 H The measure of H is 67. Solve for y. H = 9y + 4 and H = 67
  • 32. Given: (What do you know?) 9y + 4 = 67 9y = 63 y = 7 9(7) + 4 = ? 63 + 4 = ? 67 = 67 Check! Angle Measure 9y + 4 H The measure of H is 67. Solve for y. H = 9y + 4 and H = 67
  • 33. Angle Measure End of Lesson