| Curve studied by Diocles, 180 BC; Fermat; Huygens. From the Greek Kissos: ivy, probably in reference to the nervures...  Diocles (2nd century BC): Greek mathematician. |
 | Polar equation:  .Cartesian equation:  (the curve  is studied here). Rational circular cubic with a cuspidal point. Rational Cartesian parametrization:  , i.e.  (where t = tanq).Cartesian tangential angle:  .Curvilinear abscissa:  ,  .Radius of curvature:  .Area between the curve and its asymptote:  . |
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