1. ALWAYS add up to 360 degrees! No matter what polygon it is.
Angles of Polygons
Interior Angles: Exterior Angles:
Sum of Exterior Angles:
1. Find in the pentagon at the right.
Angles formed when the sides of a polygon are extended
The angles inside a polygon formed by two adjacent sides
ALWAYS add up to 360 degrees!
No matter what polygon it is.

2. Cut the polygon into triangles. Each triangle is 180 degrees.
To find the measure of interior angles of regular polygons:
You can memorize this formula: OR
You can:
2. Find the measures of the interior angles on each of the regular polygons.
3. Find the measures of the interior angles
Sum of interior angles is
Divide it by n, the number of sides, to find each interior angle measure
Cut the polygon into triangles.
Each triangle is 180 degrees.
Divide it by the number of angles to find each interior angle measure.