The proof TriangleABC ≅ TriangleDCB that is shown.
Given: AngleA ≅ AngleD; CD||AB
Prove: TriangleABC ≅ TriangleDCB
Triangles C D B and C A B are shown. Angles C D B and C A B are congruent. Sides D C and A B are parallel.
What is the missing reason in the proof?