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midpoint splits a segment into 2 segments of equal measure segment bisector passes through a midpont angle bisector splits an angle into 2 angles of eual measure segment addition postulate if B is between A and C, then AB + BC = AC Angle addition postulate if D is the interior of <ABC, then m<ABD + m<DBC + m<ABC addition property of equality if a=b and c=d then a+c = b+d subtraction property of equality if a=b and c=d then a-c = b-d Multiplication property of equality if a=b and c=d then ac=bd substitution property if a=b then a can be substituded for b, in any equation or expression an angle of measures... less than 180 have exacxtly one bisector opposite rays if the exterior sides of 2 adjacent angles are opposite rays, then the angles are supplementary 2 angles complementary... two angles complementary to the same angle of equal measure have equal measure two angles supplementary... two angles supplementary to the same angle of equal measure have equal measure perpinduclar/acute angles if the exterior sides of two adjacent acute angles are perpindicular, then the angles are complementary all right angles... have equal measure perpendicular lines... perpindicular lines intersect to form right angles 2 adj < formed by perp lines... two adjacent angles formed by perpendicular lines have equal measure 2 lines and = adj angles if two lines from adjacent angles with equal measure then the lines are perpindicular vertical angles have equal measure sum of comp angles THE SUM OF THE MEASURES OF COMPLEMENTARY ANGLES IS 90 sum of supp angles the sum of the measures of supplementary angles is 180