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Article #2460Re: Manhole covers - why circular?
From: Dave Joyce
Date: Tue, 05 Jan 1993 18:20
Date: Tue, 05 Jan 1993 18:20
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In <1993Jan5.173440.10482@informix.com> robertw@informix.com (Robert Weinberg) writes: >Manhole covers are manufactured in circular shape, rather than oval >or square, to satisfy one paramount condition. > >What is the condition, and why does a circular shape satisfy it? > >What other shapes would also satisfy the condition? There must be another condition besides what you're looking for. After all, a sphere would satisfy that condition. Even a big cork would do. So, a secondary condition, not the one you're looking for, must be that the shape be nearly flat, with just enough of a rim to fit over the hole. -- David E. Joyce Dept. Math. & Comp. Sci. Internet: djoyce@black.clarku.edu Clark University BITnet: djoyce@clarku Worcester, MA 01610-1477
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Newsgroups: rec.puzzles Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!black.clarku.edu!black.clarku.edu!djoyce From: djoyce@black.clarku.edu (Dave Joyce) Subject: Re: Manhole covers - why circular? Message-ID: <djoyce.726258048@black.clarku.edu> Organization: Clark University (Worcester, MA) References: <1993Jan5.173440.10482@informix.com> Date: 5 Jan 93 18:20:48 GMT Lines: 18