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### 16 Cards in this Set

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 perpendicular bisector a segment, ray or plane that is perpendicular to a segment at its midpoint equidistant from two points the same distance from one point as from another point distance from a point to a line the length of the perpendicular segment from the point to the line. equidistant from two lines the same distance from one line as from another line perpendicular bisector of a triangle a line ray or segment that is perpendicular to a side of a triangle at the midpoint of the side concurrent lines three or more lines that intersect in the same point point of concurrency the point of intersection of concurrent lines circumcenter of a triangle the point of concurrency of the perpendicular bisectors of a triangle angle bisector of a triangle a bisector of an angle of the triangle incenter of a triangle the point of concurrence of the angle bisectors triangle median of a triangle a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side centroid of a triangle the point of concurrency of the medians of a triangle altitude of a triangle the perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side orthocenter of a triangle the point of concurrency of the lines containing the altitudes of a triangle mid-segment of a triangle a segment that connects the midpoints of two sides of a triangle indirect proof a proof in which you prove that a statement is true by first assuming that its opposite is true. if this assumption leads to an impossibility then u have proved that the original statement is true