The path traced out by a fixed point at a Radius , where is the Radius of a rolling Circle,
sometimes also called a Contracted Cycloid.
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See also Cycloid, Prolate Cycloid
References
Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Stradbroke, England: Tarquin Pub., 1989.
Wagon, S. Mathematica in Action. New York: W. H. Freeman, pp. 46-50, 1991.