Conchoid of de Sluze
r = cos £c / a + a sec £c
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Cartesian Equation : a (x-a)(x2+y2) = k2x2 Polar Equation : r = k2 cos £c / a + a sec £c |
References
Math World : http://mathworld.wolfram.com/ConchoidofdeSluze.html
2d Curves : http://www.2dcurves.com/cubic/cubiccs.html
Jen-Chung Chuan : http://poncelet.math.nthu.edu.tw/disk6/atcm-02/talk/sluze.html
Famous Curves Index : http://www-gap.dcs.st-and.ac.uk/~history/Curves/Conchoidsl.htm