C.a.R. > Applications > Elementary Geometry > Puzzle
A puzzle for starters in C.a.R. The parts can be dragged and turned, and they will snap into the right position. If you do not know the solution, the puzzle is surprisingly difficult.
The parts are constructed from a point and another point on a fixed circle around that point. The rest of the part depends on these. The applet is made, such that the points snap with the left mouse button.