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ortho- +‎ center

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The orthocenter of an acute triangle.

orthocenter (plural orthocenters)

  1. (geometry) The intersection of the three lines that can be drawn flowing from the three corners of a triangle to a point along the opposite side where each line intersects that side at a 90 degree angle; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle.

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