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# Anticycloid Curves I: A Rolling Circle

The curve traced out by a point on the rim of a circle rolling along a straight line is called a cycloid. Now change the situation: the point moves on a straight line when the circle rolls on a suitable trace. What is the shape of this trace? We call this curve an anticycloid.

If is the distance from the point to the center of the circle, a parametrization of an anticycloid is given by
with
,
where is an elliptic integral of the first kind and is an elliptic integral of the second kind.

### DETAILS

The relationship between the the road (the anticycloid) and the wheel (the circle) that rolls smoothly on it is described in detail in the book by H. Dirnböck, Die Antizykloidenbewegung, Klagenfurt, Austria: Verlag Heyn, 1987.

### PERMANENT CITATION

Contributed by: Ralf Schaper
After work by: Hans Dirnböck
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