Exterior Angles of Triangle
- Toh Wee Teck, GeoGebra Materials Team
Use this construction to investigate the sum of the exterior angles of a polygons.
An exterior angle of a polygon is an angle formed by a side and an extension of an adjacent side. 1. Use the slider to resize the triangle. What is the sum of the exterior angles of a triangle? 2. Use the red point on the triangle to change the angle measures. Now use the slider to resize the triangle. Does changing the angle measures effect the sum of the exterior anlges?