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From: jlg@lanl.ARPA
Newsgroups: net.puzzle
Subject: Re: a good interview question (manhole covers)
Message-ID: <23497@lanl.ARPA>
Date: Tue, 19-Mar-85 20:27:09 EST
Article-I.D.: lanl.23497
Posted: Tue Mar 19 20:27:09 1985
Date-Received: Sat, 23-Mar-85 04:25:36 EST
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Organization: Los Alamos National Laboratory
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> >There is a shape other than a circle which would prevent the manhole
> >cover from falling through.  What is it?
> 
> An equilateral triangle .

Not true.  The height of an equilateral triangle is less than the length
of its side.  You could slip the triangle through by dropping it through
at one edge of the hole.

J. Giles