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Orthopole

In geometry, the orthopole of a system consisting of a triangle ABC and a line ℓ in the same plane is a point determined as follows. Let A ′, B ′, C ′ be the feet of perpendiculars dropped on ℓ from A

Brocard points

In geometry, Brocard points are special points within a triangle. They are named after Henri Brocard (1845–1922), a French mathematician.

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