Question

the point of congruence of three altitude is called​

Answer 1

Answer:

The three (possibly extended) altitudes intersect in a single point, called the orthocenter of the triangle, usually denoted by H.

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Answer 2

The three (possibly extended) altitudes intersect in a single point, called the orthocenter of the triangle, usually denoted by H. The orthocenter lies inside the triangle if and only if the triangle is acute (i.e. does not have an angle greater than or equal to a right angle).