Circle Rolling inside Another
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A circle with a pen rolls inside another circle, generating curves called hypotrochoids. This computer graphic analog of the classic Spirograph toy has more choices for the parameters.
Contributed by: Carlo Miñon (August 2013)
Open content licensed under CC BY-NC-SA
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"Circle Rolling inside Another"
http://demonstrations.wolfram.com/CircleRollingInsideAnother/
Wolfram Demonstrations Project
Published: August 21 2013