Exterior Angles of Polygons

Use this construction to investigate the sum of the exterior angles of a polygons.

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)

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?

Barbara Perez, 11/12/06, Created with GeoGebra