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How to construct the orthocenter of a triangle with compass and straightedge or ruler. The orthocenter is the point where all three altitudes of the triangle intersect. An altitude is a line which passes through a vertex of the triangle and is perpendicular to the opposite side. A Euclidean construction
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geometry - Prove that line through intersection of line through foots of heights and opposite line and orthocenter is perpendicular to median. - Mathematics Stack Exchange
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Orthocenter Formula coordinate geometry of triangle & proof
