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From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.jokes,net.puzzle
Subject: Re: Manhole covers (interview question)
Message-ID: <9666@brl-tgr.ARPA>
Date: Mon, 1-Apr-85 15:04:56 EST
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Posted: Mon Apr  1 15:04:56 1985
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> 
>   Think about what "beveled" means.
> Yes, even a square cover will not fall in its hole if bevelled enough.
> (Think of it as essentially upside-down pyramid shaped).
> Clearly, anything larger number of edges would work better and better.
> 
It's really not beveled.  It's that the covers are bigger than the hole.
Round covers are cylinders.  If you use a square cover, it has to be larger
than the diagonal of the hole to prevent it from falling in.

-Ron