Limaçon
A famliy of related curves usually
expressed in polar coordinates.
The cardioid is a special kind
of limaçon.
Limaçon: r = b + a cos θ (horizontal,
pictured below) or r = b + a sin θ (vertical)
Note: If a = b the curve is a cardioid.
See
also
Convex, polar
curves
