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?

Congruent polygons:

Named by the number of sides

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.