1. Polygons---Terms Geometry (Holt 6-1) K. Santos

2. Polygon Polygon—enclosed figure --has at least 3 sides (segments) --sides only intersect at their endpoints --no adjacent sides are collinear --poly (many) gon (sides)

3. Examples on Non-polygons

4. Parts of a Polygon

5. Diagonals

6. Convex vs Concave Extend the sides of the polygon to figure out if a figure is convex or concave. If all the extensions stay outside of the polygon then it is convex. If any of the extensions go into the polygon then it is concave. concave

7. Equiangular/Equilateral/Regular Equiangular—all equal/congruent angles Equilateral—all equal/congruent sides Regular polygon—both equiangular and equilateral

8. Regular vs irregular polygon Regular Polygons Irregular Polygons

9. Classifying polygon based on number of Sides Number of Sides Name of polygon 3triangle 4quadrilateral 5pentagon 6hexagon 7septagon/heptagon 8octagon 9nonagon 10decagon 11undecagon 12dodecagon 1313-gon nn-gon