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Midpoint the point on the segment that divides it into two congruent segments Segment Bisector a segment, ray, line, or segment that intersects a segment at its midpoint Bisect to divide the segment into two congruent segments Midpoint Formula the coordinates of a segment are the averages of the x-coordinates and the y-coordinates of the endpoints Angle Bisector a ray that divides an angle into two congruent angles Complementary Angle if the sum of their measures in 90 degrees Supplementary Angle if the sum of their measures is 180 degrees Adjacent Angle If they share a common vertex and side but have no common interior point Theorem a true statement that follows from other true statements Theorem 2.1 if 2 angles are complementary to the same angle then they are congruent THeorem 2.2 if 2 angles are supplementary to the same angle then they are congruent