Triangle Hunt

Click Start to reveal 5 fixed points, labeled A through E, and start the clock. Click any 3 of them — whatever type of triangle they make gets checked off on the list. There's no target to guess at: just keep trying different combinations of 3 points. There are only 10 possible triangles among the 5 points, and every one of the 7 types in the “Types of Triangles” chart is achievable somewhere among them. Check off all 7 in as few attempts, and as little time, as you can.