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the point of concurrency of the medians of a triangle
point of concurrency of the altitudes of a triangle
The point of concurrency of the perpendicular bisectors of a triangle
the point of concurrency of the angle bisectors of a triangle
segment that connects the midpoints of two sides of a triangle
the perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel)
segment from a vertex to the midpoint of the opposite side