Answer:
Step-by-step explanation:
1. Statement: AB=CD; BC=AD
Reason: Given
2. Statement: BD=BD
Reason: reflexive property
3. Statement: triangleCBD= triangle ADB
Reason: angles are congruent to each other
4. Statement:∠ADB=∠CBD; ∠ABD=∠BDC
Reason: the corresponding parts of congruent angles are ≡
5. Statement: AB||CD; BC||AD
Reason: If alternate interior angles are congruent then lines are parallel
