# Roulette (Hypotrochogon) of a Polygon Rolling inside Another Polygon

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A hypotrochogon is the trace (roulette) of a point attached to a regular polygon rolling without slipping inside another regular polygon [1].

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Contributed by: Erik Mahieu (April 2017)

Open content licensed under CC BY-NC-SA

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Reference

[1] T. M. Apostol and M. A. Mnatsakanian, "Generalized Cyclogons," *Math Horizons*, 10(1), 2002, pp. 25–28. www.mamikon.com/USArticles/GenCycloGons.pdf.

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