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Geometry

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Geometry

1. 1. Geometry Ruthelyn B Turner
2. 2. Standards • MA.3.M3G1 - Students will further develop their understanding of geometric figures by drawing them. They will also state and explain their properties. • MA.3.M3G1.a - Draw and classify previously learned fundamental geometric figures and scalene, isosceles, and equilateral triangles. • MA.3.M3G1.b - Identify and compare the properties of fundamental geometric figures.
3. 3. • Geometry is a kind of mathematics that deals with shapes and figures. Geometry explains how to build or draw shapes, measure them, and compare them. People use geometry in many kinds of work, from building houses and bridges to planning space travel.
4. 4. Geometry Terms • Points, lines, and angles are basic terms of geometry. • A point is usually represented by a dot. • A line is an object that extends without end in both directions. It has arrow heads on both ends. • A line segment is a part of a line with two end points. • A ray has one end point and half of a line.
5. 5. • Two rays with the same end point form an angle. • If the rays are the two halves of a single line, the angle is called a straight angle. • A straight angle can be thought of like a book opened flat on a desk. • An angle opened half that far is called a right angle
6. 6. • Angles are measured in degrees. • A right angle measures 90 degrees. They can be found in many different shapes and objects. • Acute angles are smaller than a right angle. (0-89 degrees) • Obtuse angles are larger than a right angle but smaller than a straight angle. (91-179 degrees)
7. 7. Credits • Geometry: Right Angles. [Video]. Retrieved October 24, 2010, from Encyclopædia Britannica Online School Edition: http://www.school.eb.com.proxygsu- slib.galileo.usg.edu/elementary/art-82789 • Geometry. (2010). In Britannica Elementary Encyclopedia. Retrieved October 25, 2010, from Encyclopædia Britannica Online School Edition: http://www.school.eb.com.proxygsu- slib.galileo.usg.edu/elementary/article?articleId=353174 •