#### Transcript Chapter 1-6 (Classify Polygons)

Chapter 1-6 (Classify Polygons) What is a polygon?

A closed plane figure formed by 3 or more line segments, with no two sides being collinear.

Chapter 1-6 (Classify Polygons) Two types of polygons Convex: All vertices going outward Concave: A vertex going inside the polygon

Chapter 1-6 (Classify Polygons) Example Tell whether the following polygons are convex or concave

Chapter 1-6 (Classify Polygons) How do you classify polygons?

Named by the number of sides Congruent polygons: After 12 sides, the general name is a *n*-gon, where n is the number of sides Equilateral: All sides are congruent Equiangular: All angles are congruent Regular: Convex polygon that is both

Chapter 1-6 (Classify Polygons) Example Classify the polygons by the number of sides. Is it equilateral, equiangular, or regular?

Chapter 1-6 (Classify Polygons) Example

Chapter 1-6 (Classify Polygons) Example The expression (4x + 8)º and (5x – 5)º represent the measures of 2 of the congruent angles in the previous problem. Find the measure the an angle.