Interior and Exterior Angles of a Pentagon

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 pentagon's BIG BLACK VERTICES each time before you drag the slider!!! Note: The points on the pentagon's sides are midpoints. Also note: For interior angles, you can make either the pink or green angle measure greater than 180 degrees (if you'd like)!
Questions: 1) What happened when you dragged the black vertices? 2) When you dragged the slider to the other end, what happened? 3) From your observations, what is the sum of the measures of the interior angles of     any pentagon?   4) Select Exterior Angles. What happened when you dragged the vertices? 5) When you dragged the slider to the other end, what happened? 6) From your observations, what is the sum of the measures of the exterior angles of     any pentagon?