Answer:
Linear Pair Postulate
Step-by-step explanation: Complements is wrong because we are not trying to prove that two angles of different figures are congruent and we are given two angles are added up to 180 not 90. Supplements is wrong because we arent trying to prove that two angles of different figures are congruent. Vertical Angles is wrong becuase we dont know if these angles are made by intersecting lines. Linear Pair Postulate states that hat two angles that form a linear pair are supplementary; that is, their measures add up to 180 degrees.