# Difference between revisions of "Interior angle"

The interior angle is the angle between two line segments, having two endpoints connected via a path, facing the path connecting them.

The regular polygons are formed by have all interior angles equiangular

This is the complementary concept to exterior angle

## Properties

1. All the interior angles of an $n$ sided regular polygon, sum to $(n-2)180$ degrees.
2. All the interior angles of an $n$ sided regular polygon,are $180(1-{2\over n})$ degrees.
3. As the interior angles, of an $n$ sided regular polygon get larger, the ratio of the perimeter to the apothem approaches $\pi$