1. Fun with Geometry!! Miss B. Kelley’s 3 rd Grade Class March 2006

2. Geometry is the study of… –Shapes –Lines, rays, and line segments –Angles –Area –Perimeter –Volume

3. SHAPES Click on the shape below for more fun and exploration of geometric SHAPES!

4. LINES, LINE SEGMENTS & RAYS A line has no beginning point or end point. Imagine it continuing indefinitely to both directions. We can illustrate that by little arrows on both ends. A line segment has a beginning point and an end point. All the sides of this triangle are line segments. A ray has a beginning point but no end point. Think of sun's rays: they start at sun and go on forever...

5. ANGLES What is an angle? –An angle is made up from two rays that have the same beginning point. That point is called the vertex and the two rays are called the sides of the angle. What is an angle? –Right Angles equal 90 degrees –Acute Angles are <90 degrees –O btuse Angles are >90 degrees Have more fun exploring these angles that exist is space! Vertex Ray CLICK HERE

6. WHAT IS AREA? Math Book Definition of Area: the number of square units needed to cover a region or figure. In more understandable language…area is how much of a surface you cover when you lay a shape down. For example, when you have your math book on your desk you have LESS AREA to work on because it has been covered.

7. PERIMETER Have you ever thought about how far you walked when you walked around the outside of your house? If you did then you were trying to find out the PERIMETER! 2 ft. 5 ft. 3 ft. Calculate the total of all the measurements. (2ft. x 4) + (3 ft. x 2) +(5 ft. x 2)= (8 ft. + 6 ft.) + 10 ft. = 14 ft. + 10 ft = The perimeter is 24 ft.

8. Can you turn up the VOLUME? No silly!! The VOLUME in math isn’t about how loud the music is. VOLUME in math is how much space a 3-dimensional figure encloses. –Encloses means to keep in or to hold. We would use our one unit cubes (cubic units) to find our answer. –You would ask yourself, “How many cubic units (one unit cubes) would it take to create a 3-D Rectangle?” Find the two orange cubes that will take you to the two games! How many cubic units will it take to fill in this empty cube?