Definition:Chord of Contact
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Definition
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:
$UV$ is known as the chord of contact on $\CC$ with respect to $P$.
Ellipse
Let $\EE$ be an ellipse embedded in the plane.
Let $P$ be a point also embedded in the plane which is outside the boundary of $\EE$.
Let $\TT_1$ and $\TT_2$ be tangents to $\EE$ passing through $P$.
Let:
$UV$ is known as the chord of contact on $\EE$ with respect to $P$.