Definition:Limaçon of Pascal

Definition
Let $C$ be a circle of diameter $a$ with a distinguished point $O$ on the circumference.

Let $OQ$ be a chord of $C$.

The limaçons of Pascal are the loci of points $P$ in the plane such that:
 * $PQ = b$

where:
 * $OPQ$ is a straight line
 * $b$ is a real constant.

Shape

 * Limacons-of-Pascal.png

Also known as
The (strictly incorrect) form limacon can be seen for limaçon, which makes transcription easier.

Also see

 * Equation of Limaçon of Pascal