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[[[> IMG:Picture5.png ]]] The Cardioid is a plane, closed, heart-shaped curve with one cusp. A typical cardioid is generated by the equation in polar coordinates: EQN:r=a(1+cos\theta) ---- One of the Named Curves on this site. ---- * http://mathworld.wolfram.com/Cardioid.html * http://en.wikipedia.org/wiki/Cardioid