\begin{definition}[Definition:Limaçon of Pascal]
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.
\end{definition}