The proof that ΔABC ≅ ΔCDA is shown. Given: ∥ Line segment A B is parallel to line segment C D and Line segment B C is parallel to line segment D A ∥Prove: ΔABC ≅ ΔCDAParallelogram A B C D is shown. A line is drawn from point A to point C to form 2 triangles. What is the missing reason in the proof?StatementsReasons1. AB ∥ CD; BC ∥ DA1. given2. Quadrilateral ABCD is a ▱2. definition of parallelogram3. AB ≅ CD; BC ≅ DA3. opposite sides of a parallelogram are ≅4. AC ≅ AC4. reflexive property5. ΔABC ≅ ΔCDA5. ?perpendicular bisector theoremPythagorean theoremHL theoremSSS congruence theorem