\begin{definition}[Definition:Chord of Contact/Circle]
Let $\CC$ be a circle embedded in the plane.
Let $P$ be a point also embedded in the plane which is outside the boundary of $\CC$.
Let $\TT_1$ and $\TT_2$ be a tangents to $\CC$ passing through $P$.
Let:
:$\TT_1$ touch $\CC$ at $U$
:$\TT_2$ touch $\CC$ at $V$.
$UV$ is known as the '''chord of contact''' on $\CC$ with respect to $P$.
\end{definition}