What is the point of concurrency of the three altitudes of a triangle?

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Multiple Choice

What is the point of concurrency of the three altitudes of a triangle?

Explanation:
Altitudes are the lines from each vertex perpendicular to the opposite side. In any triangle these three lines meet at a single point, and that point is called the orthocenter. Where it lies depends on the type of triangle: inside for acute, at the right-angle vertex for a right triangle, or outside for obtuse. This center is different from others defined by specific lines: the circumcenter comes from perpendicular bisectors, the centroid from medians, and the incenter from angle bisectors. So, the concurrency of the three altitudes identifies the orthocenter.

Altitudes are the lines from each vertex perpendicular to the opposite side. In any triangle these three lines meet at a single point, and that point is called the orthocenter. Where it lies depends on the type of triangle: inside for acute, at the right-angle vertex for a right triangle, or outside for obtuse. This center is different from others defined by specific lines: the circumcenter comes from perpendicular bisectors, the centroid from medians, and the incenter from angle bisectors. So, the concurrency of the three altitudes identifies the orthocenter.

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