10.1 Naming Polygons

1. 10.1 Naming Polygons

2. Vocabulary Naming Polygons What You'll Learn You will learn to name polygons according to the number of _____ and ______. sides angles 1) regular polygon 2) convex 3) concave

3. Naming Polygons closed figure A polygon is a _____________ in a plane formed by segments, called sides. sides angles A polygon is named by the number of its _____ or ______. A triangle is a polygon with three sides. The prefix ___ means three. tri

4. Naming Polygons Prefixes are also used to name other polygons. tri- 3 triangle quadri- 4 quadrilateral penta- 5 pentagon hexa- 6 hexagon hepta- 7 heptagon octa- 8 octagon nona- 9 nonagon deca- 10 decagon

5. Q P R U S T Naming Polygons Terms Consecutive vertices are the two endpoints of any side. A vertex is the point of intersection of two sides. A segment whose endpoints are nonconsecutive vertices is a diagonal. Sides that share a vertex are called consecutive sides.

6. equiangular but not equilateral regular, both equilateral and equiangular equilateral but not equiangular Naming Polygons sides An equilateral polygon has all _____ congruent. angles An equiangular polygon has all ______ congruent. equilateral equiangular A regular polygon is both ___________ and ___________. Investigation: As the number of sides of a series of regular polygons increases, what do you notice about the shape of the polygons?

7. Naming Polygons A polygon can also be classified as convex or concave. If any part of a diagonal lies outside of the figure, then the polygon is _______. If all of the diagonals lie in the interior of the figure, then the polygon is ______. concave convex

8. Naming Polygons End of Section 10.1