# Interior and Exterior Angles of a Triangle

- Author:
- Marilu Deal, Tim Brzezinski

- Topic:
- Angles

Interact with the applet below for a few minutes.
Then, answer the questions that follow.

*Be sure to change the locations of the triangle's WHITE VERTICES each time before you drag the slider!!!***Questions:**1) When dragging the white vertices, did the measures of the other angles change? 2) Drag the slider to the other end. From your observations, what is the sum of the measures of the interior angles of

*any triangle?*3) Select exterior angles. When dragging the white vertices, did the measures of the other angles change? 4) Drag the slider to the other end. From your observations, what is the sum of the measures of the exterior angles of

*any triangle?*