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Anticycloid Curves II: A Rolling Ellipse

​
roll the ellipse
Pi
adjust the foci
F
1
​,
F
2
0.5
trace of
F
1
trace of
F
2
the center
Anticycloid curves are defined by an inverse problem: when a circle rolls on an anticycloid then a fixed point in the circle moves on a straight line. The trace of a focus of an ellipse rolling on a straight line generates these curves.
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