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Topic: Hypocycloids as envelopes
Replies: 2   Last Post: Mar 5, 2007 6:53 PM

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Christopher J. Henrich

Posts: 2
From: Buffalo, New York
Registered: 2/27/07
Hypocycloids as envelopes
Posted: Feb 27, 2007 10:34 AM
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There is a theorem to the effect that a hypocycloid with p cusps can be moved so that its cusps trace out hypocycloids with q cusps, and then the moving hypocycloid envelops a hypocycloid with pq cusps.

Can anyone cite a reference for this?

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