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November 07, 2016 Perpendicular bisector - line or segment that passes through the midpoint of a line segment at a right angle. November 07, 2016 perpendicuar bisector theorem - if CD is perp. bisector of AB then CA = CB November 07, 2016 November 07, 2016 circumcenter - the intersection of the perpendicular bisectors in a triangle. November 07, 2016 Angle bisector - bisects an angle (makes two congruent angles) Angle bisector theorem - if a point is on the angle bisector then it is equidistant from the sides of the angle. converse angle bisector theorem - if a point is in the interior of an angle and is equidistant from the the sides of an angle then it is on the angle bisector November 07, 2016 November 07, 2016 November 07, 2016 Incenter - the intersection of the angle bisectors of a triangle. November 07, 2016 median - connects the vertex of a triangle to the midpoint of the opposite side Centroid - the intersection of the medians of a triangle (center of gravity of the triangle) November 07, 2016 November 07, 2016 Altitude - connects a vertex of a triangle to the opposite side at a right angle. Orthocenter - the intersection of the altitudes in a triangle.