Unit A: Geometry

Chapter 1: Polygons

Summary

Properties of Polygons

• Regular polygons have sides of equal length and interior angles of equal measure.

• Irregular polygons have unequal sides or angles or both.

• To find the sum of interior angles of a polygon, S, use the formula
• S = 180°(n – 2), where  n represents the number of sides of the polygon.

• To find the angle measure of an interior angle in a regular polygon, M, use the formula
• $M=\frac{180\left(n-2\right)}{n}$, where n represents the number of sides of the polygon.