The pedal curve of the cissoid, when the pedal point is on the axis beyond the asymptote at a
distance from the cusp which is four times that of the asymptote
is a cardioid.
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Cite this as:
Weisstein, Eric W. "Cissoid of Diocles Pedal
Curve." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CissoidofDioclesPedalCurve.html