Dynamic Demonstration: Sum of Exterior Angles of a Triangle Equals 360°

2012-05-18 02:59
This GeoGebra example dynamically demonstrates the exterior angle sum theorem: the sum of the three exterior angles of any triangle is always 360°. By constructing a triangle and the exterior angles formed by extending each side, the applet uses geometric transformations—rotation, translation, and reflection—to bring the three exterior angles together, visually showing they form a complete revolut