Missing Square Puzzle

This dynamic worksheet demonstrate the missing square puzzle, a paradoxical dissection discovered by an amateur mathematician named Paul Curry and popularized by Martin Gardner. The puzzle appears to show a right triangle which is cut into 4 pieces, which are rearranged to form an identical triangle with a square missing from it. Press the play button or drag the slider to see this dissection in action. See if you can figure out where the missing area goes. The first checkbox will hint at why it works, and the second checkbox will show you the missing area.