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Construction and equations
Consider the circle C through the point O, and tangent line L to the circle at point O. For each point Q on C, draw the points P such that PQ is parellel to the tangent line L and PQ = OQ. The collection of points P forms the bifolium.
The bifolium is a quartic plane curve with equation
In polar coordinates, its equation is
References
Bifolium Wikipedia(Text) CC BY-SA