Interior and Exterior Angles
- Shawn Godin
In any polygon, the angles "inside" the polygon are called interior angles. If we extend any side beyond a vertex, the angle formed by this new segment and the adjacent side is called an exterior angle. In the sketch below you can move any of the vertices of . If you click on any of the red interior angles, you will see one of the associated exterior angles and the relationship between the exterior and interior angles.