\begin{definition}[Definition:Self-Conjugate Triangle]
Let $\CC$ be a circle.
Let $\triangle PQR$ be a triangle such that:
:$PR$ is the polar of $Q$
:$QR$ is the polar of $P$
with respect to $\CC$.
Then $\triangle PQR$ is said to be a '''self-conjugate triangle with respect to $\CC$'''.
\end{definition}