1. 2.5 How Can See It? Pg. 20 Classify Polygons

2. 2.5 – How Can I See It?______________ Classify Polygons In this section you will discover the names of the many different polygons and how they are classified.

3. Polygon: 2. No sides overlap 3. No curved sides 1. Has at least 3 sides

4. Side: Line segment forming the polygon M T S R Q

5. Vertex: Point where two sides meet M T S R Q M T S R Q

6. Consecutive Sides: Two sides that share a point, one after the other M T S R Q

7. Diagonal: Segment that joins two nonconsecutive sides M T S R Q

8. # of sidesName 3 4 5 triangle quadrilateral pentagon

9. # of sidesName 6 7 8 9 10 11 12 13 n hexagon heptagon octagon nonagon decagon 11-gon dodecagon n-gon 13-gon

10. Convex: No corners point inside the shape Concave: Not convex! A corner points inside the shape

11. 1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not? Curved side Yes, Concave or Convex OR No, _________________

12. 1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not? Yes, Concave or Convex OR No, _________________

13. 1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not? Yes, Concave or Convex OR No, _________________

14. 1. State whether the shape is a polygon. If yes, is it concave or convex? If no, why not? Yes, Concave or Convex OR No, ____________________ Overlaps

15. EquilateralEquiangularRegular All sides are congruent All angles are congruent All sides AND all angles are congruent

16. 2. Classify the name of the polygon by the number of sides. Is the polygon equilateral, equiangular, regular, or neither? Equilateral Pentagon a.

17. b. Regular quadrilateral

18. c. Equiangular Octagon

19. d. Regular Heptagon

20. e. equilateral decagon

21. f. neither Hexagon