A figure has rotational symmetry if it looks identical after a rotation between 0˚ and 360˚ about its center. Slide the green dot to rotate the polygon a specified angle. Look for ALL angles of rotation that result in the figure looking identical to the original (in math, we would say "carry the polygon back onto itself"). Then, slide the black dot to change the number of sides on the polygon and repeat the above steps. Look for patterns of how to find ALL angles of rotation that carry a polygon back onto itself.