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From: colonel@gloria.UUCP (Col. G. L. Sicherman)
Newsgroups: net.puzzle
Subject: Re: triangular manhole covers
Message-ID: <1022@gloria.UUCP>
Date: Mon, 18-Mar-85 16:24:01 EST
Article-I.D.: gloria.1022
Posted: Mon Mar 18 16:24:01 1985
Date-Received: Sat, 23-Mar-85 02:34:17 EST
References: <1300@ut-sally.UUCP> <441@hou2b.UUCP> <446@bonnie.UUCP>
Organization: The Church of Artificial Intelligence
Lines: 18

> >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