AAS Congruence Rule Angle-Angle-Side Two triangles are congruent, if two pairs of corresponding angles and one pair of opposite sides are equal in both triangles. In above figure there are two triangles, △CAB and △PQR  △CAB and △PQR has two pairs of  corresponding angles ∠A = ∠R, ∠C = ∠P and  one pair of opposite sides side CB = side PQ.  […]