Definition:Polar of Point/Circle
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The polar of $P$ with respect to $\CC$ is the straight line whose equation is given by:
- $x x_0 + y y_0 = r^2$
Let $\LL$ be the polar of $P$ with respect to $\CC$.
Then $P$ is known as the pole of $\LL$.
- Definition:Chord of Contact on Circle: when $P$ is specifically outside $\CC$
- Results about polars of points can be found here.