Generating a Cardioid V: Rolling a Hoop
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A hoop rolls without slipping around the outside of a stationary circle of half its diameter. The locus of a fixed (red) point on the hoop is a cardioid.
Contributed by: Jaime Rangel-Mondragon (March 2011)
Open content licensed under CC BY-NC-SA
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"Generating a Cardioid V: Rolling a Hoop"
http://demonstrations.wolfram.com/GeneratingACardioidVRollingAHoop/
Wolfram Demonstrations Project
Published: March 7 2011