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From: wws@whuxlm.UUCP (Stoll W William)
Newsgroups: net.puzzle
Subject: Re: a good interview question (manhole covers)
Message-ID: <711@whuxlm.UUCP>
Date: Sun, 17-Mar-85 14:57:18 EST
Article-I.D.: whuxlm.711
Posted: Sun Mar 17 14:57:18 1985
Date-Received: Mon, 18-Mar-85 02:16:42 EST
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Organization: AT&T Bell Laboratories, Whippany
Lines: 14

> > There is a shape other than a circle which would prevent the manhole
> > cover from falling through.  What is it?
> 
> There are several.
> 	Triangle, pentagon, etc...
> 

I disagree that triangles and pentagons couldn't fall through.
If you stand them flat on one of their sides, the height
will always be less than if you pivot them (slightly) on a vertex.
Can anyone express this mathematically? -- I was never the
geometry wizard.

Bill Stoll, ..!whuxlm!wws