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Mathematics 30 Online
OpenStudy (anonymous):

whats an orthocenter of a triangle?

OpenStudy (schrodinger):

It's the point at which the three altitudes of a triangle intersect. Altitudes are lines which intersect with both the vertex of a triangle and the middle of the side of the triangle opposite to that vertex, as shown in this diagram:|dw:1331594454196:dw|

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