Definition:Orthic Triangle

Definition
Let $\triangle ABC$ be a triangle.

Let $\triangle DEF$ be the triangle formed by the feet of the altitudes $AD$, $BC$ and $ED$ of $\triangle ABC$.


 * Orthic-Triangle.png

$\triangle DEF$ is known as the orthic triangle of $\triangle ABC$.

That is, the orthic triangle of $\triangle ABC$ is the pedal triangle of its orthocenter.