Exterior Angles Sum of Polygon

This worksheet aims at exploring the sum of exterior angles of polygons.

1. Play the movie. 2. How many degrees do the car turn in total? 3. Drag one of the points inward to make the polygon non-convex. 4. Play the movie again. 5. Can you find out a relation of the exterior angles of non-convex polygon from the movie? (Hint: Consider the direction of the car turning)