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angle addition postulate
Angles can be added together if they are adjacent
, If P is in the interior of <RST, then m<RSP + m<PST = m<RST
congruent supplements theorem
if two angles are supplementary to the same angle (or to congruent angles) then they are congruent
congruent complements theorem
If two angles are complements of the same angle (or of congruent angles), then the two angles are congruent.
common segments theorem
Given collinear points A, B, C and D arranged as shown if line AB is congruent to line CD then line AC is congruent to line BD a__,__b_______c__,__d
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