[net.puzzle] triangular manhole covers

colonel@gloria.UUCP (Col. G. L. Sicherman) (03/19/85)

> >There is a shape other than a circle which would prevent the manhole
> >cover from falling through.  What is it?
> 
> An equilateral triangle .

Just to put a stop to these silly answers, here's how to drop a
triangular manhole cover through a matching hole:

----------      -                     ----------
\        /      I            /        \        /
 \COVER /       I           /          \ HOLE /		CLUNK!
  \    /  -->   I  -->     /   -->      \    /
   \  /         I         /              \  /
    \/          I        /                \/

-- 
Col. G. L. Sicherman
...{rocksvax|decvax}!sunybcs!colonel