1. LESSON 15.1 OBJECTIVE : WHEN PRESENTED WITH VARIOUS POLYGON PICTURE CARDS, THE STUDENTS WILL ORALLY SAY WHAT KIND OF POLYGON IT IS BASED ON ITS SIDES AND THEY WILL WRITE WHETHER OR NOT IT IS A REGULAR OR NON- REGULAR POLYGON WITH 90% ACCURACY. STANDARD: M6.C.1.1.1: IDENTIFY, CLASSIFY AND/OR COMPARE POLYGONS (UP TO TEN SIDES.) Polygons

2. What is a polygon? A polygon is a closed plane figure with straight sides that are line segments. Polygons are classified by the number of their sides, angles, and vertices. Examples Non-Examples

3. Vertex Each point where the line segments meet Number of vertices = Number of sides This shape has 5 vertices!

4. Triangle 3 sides 3 angles 3 vertices

5. Quadrilateral 4 sides 4 angles 4 vertices

6. Pentagon 5 sides 5 angles 5 vertices

7. Hexagon 5 sides 5 angles 5 vertices

8. Heptagon 7 sides 7 angles 7 vertices

9. Octagon 8 sides 8 angles 8 vertices

10. Nonagon 9 sides 9 angle 9 vetices

11. Decagon 10 sides 10 angles 10 vertices

12. Regular vs. Non-Regular A regular polygon is a polygon in which all sides and angles are congruent A non-regular polygon is a polygon in which all of the sides and angles are NOT congruent

13. How many vertices in each polygon?

14. Is it regular or non-regular?

15. What is the name of the polygon? Name the polygon by using the number of sides. Tell if it is a regular or non-regular polygon. Example: This is a regular heptagon. This polygon has seven sides, which makes it a heptagon. All of the sides are equal, so it is a regular polygon.

16. What is the name of the polygon?

17. What is the name of this polygon?

18. What is the name of the polygon?