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Orthocenter

Orthocenter

The point at which the three (possibly extended) altitudes of a triangle intersect. The orthocenter is one of the centers of a triangle.

Orthocenter of an Acute Triangle
(Click on the image or here to launch an interactive java applet)
Triangle ABC with altitudes from each vertex (dashed red lines) intersecting at the orthocenter point inside the triangle.

Orthocenter of an Obtuse Triangle
Obtuse triangle ABC with three altitudes (dashed red lines) extended beyond sides, intersecting at orthocenter outside the...