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centroid

the point of concurrency of the medians of a triangle

orthocenter

point of concurrency of the altitudes of a triangle

circumcenter

The point of concurrency of the perpendicular bisectors of a triangle

incenter

the point of concurrency of the angle bisectors of a triangle

midsegment

segment that connects the midpoints of two sides of a triangle

altitude

the perpendicular distance from the base of a geometric figure to opposite vertex (or side if parallel)

median

segment from a vertex to the midpoint of the opposite side