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An hypocycloid is a roulette traced by a point attached to a circle of radius r rolling around the inside of a fixed circle of radius R, where the point is a distance d from the center of the interior circle.

14 Dec 2014

so cool!

01 Feb 2015

If inner disk radius divides by outer disk radius without remainder there will be only trace with "quotient" angle-loops (Like 300/100 = 3, so will be 3 angles)

26 Nov 2016

Well done

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