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Article #2491Re: Manhole covers - why circular?
From: Tom Magliery
Date: Tue, 05 Jan 1993 18:50
Date: Tue, 05 Jan 1993 18:50
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1163 bytes
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? spoiler alert... Wouldn't want it dropping through its own hole, now, would we? >What other shapes would also satisfy the condition? Trivially, anything with a circle as its convex hull (e.g., a planar donut). I can't think of any others, without using to my advantage the width of the little ridge that the manhole cover is resting on. This is not to say there aren't any. mag -- Tom Magliery ** Dept of CS ** 1304 W Springfield ** Champaign IL 61820 ** USA
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Newsgroups: rec.puzzles Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!sdd.hp.com!ux1.cso.uiuc.edu!cs.uiuc.edu!sparc0b!mag From: mag@cs.uiuc.edu (Tom Magliery) Subject: Re: Manhole covers - why circular? Message-ID: <C0E9nL.JKM@cs.uiuc.edu> Sender: news@cs.uiuc.edu Reply-To: mag@cs.uiuc.edu Organization: University of Illinois at Urbana-Champaign References: <1993Jan5.173440.10482@informix.com> Date: Tue, 5 Jan 1993 18:50:08 GMT Lines: 21