# 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?