Look at the figures. How can you prove the triangles are congruent?

Answer: 1. Congruence among line segments: Two line segments are congruent if they have the same length. Thus, line segment PQ ≅ line segment RS as PQ = RS = 6 cm. 2. Congruence of Angles: Two angles are congruent if they have the same measure. Thus, ∠AO'B ≅ ∠QOP, as m ∠AO'B = m ∠QOP = 40