?-Dave_Mysterious-?10 Dec 2003

An equalateral triangle still wouldn't fall through the hole. You're theory is therefore wrong, or at best incomplete. It just so happens that the circle can't fall down the hole, but that doesn't explain why it isn't triangle shaped. Is that why you wrote "Tri-again"? Clearly the real reason must be so that the workman is presented with the same hole no matter what angle he approaches it from. e.g. if it was square, a man approaching from 45 degrees would have more chance of falling in than a man approaching from 0 degrees, which would be unfair.