# Dynamic Geometry 1451: Orthopole of a Line

If perpendiculars
AA', BB', and CC' are dropped to any line L from the vertices of a triangle
ABC, then the perpendiculars A'A''. B'B'', and C'C'' to the opposite sides
BC, AC, and AB, respectively, are concurrent at a point P called the orthopole
of the line L and triangle ABC.

See solution below

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