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median a segment connecting the midpoint of a side of a triangle to the opposite vertex angle bisector a segment from a vertex to the opposite side of a triangle that bisects the angle altitude a segment from the vertex of a triangle perpendicular to the line containing the opposite side perpendicular bisector a line/segment passing through the midpoint of a side that is perpendicular to that side concurrent lines three of more lines that meet in a common point circumcenter the point of concurrency of the perpendicular bisectors incenter the point of concurrency of the angle bisectors of a triangle centroid the point of concurrency of the medians of a triangle centroid center of gravity orthocenter the point of concurrency of the altitudes of a triangle