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epicycloid
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epicycloid

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A seven-cusped epicycloid, formed by a point on the circumference of a circle (of diameter d) that rolls around another circle (of diameter 7d/3).

In geometry, a curve resembling a series of arches traced out by a point on the circumference of a circle that rolls around another circle of a different diameter. If the two circles have the same diameter, the curve is a cardioid.


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