Nephroid I

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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The nephroid, so called from its kidney shape, is an epicycloid traced by a point on the circumference of a circle as it rolls around the circumference of a circle twice as large. In this construction it's the envelope of circles centered on the central circle and tangent to a diameter of it.

Number of circles:

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Created 29 November 2010, Last Update 18 March 2012

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