Exterior Angle Sum of a Triangle
Before you begin: Feel free to move the triangle's vertices (corners) wherever you'd like. You can also control the size of the blue exterior angle by using the blue slider. Interact with the applet for a minute or two. Then answer the question that follows.
The 3 COLORED ANGLES are said to be the EXTERIOR ANGLES of this triangle.
What can you conclude about the measures of the exterior angles of ANY TRIANGLE?