Uploaded June 2017 | Updated September 2026, 1 week ago

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demonstrations.wolfram.com/TwoConditionsForATetrahedronToBeOrthocentric

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An altitude of a tetrahedron is a line from a vertex perpendicular to the face opposite that vertex. A tetrahedron is orthocentric if the four altitudes meet at the same point, which is called the orthocenter or the Monge point. Let the opposite side le...

Contributed by: Izidor Hafner

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