Definition:Polar Circle

Theorem

Let $\CC$ be a circle.

Let $\triangle PQR$ be a self-conjugate triangle with respect to $\CC$.

Then $\CC$ is called the polar circle of $\triangle PQR$.

Also see

• Triangle is Self-Conjugate to Unique Circle

Sources

• 1933: D.M.Y. Sommerville: Analytical Conics (3rd ed.) ... (previous) ... (next): Chapter $\text {III}$. The Circle: $9$. Conjugate triangles: Example $2$