What is the missing reason in the proof?
Given: with diagonal
1. 1. Definition of parallelogram
2. 2. Alternate Interior Angles Theorem
3. 3. Definition of ...
4. 4. Alternate Interior Angles Theorem
5. 5. ?
6. 6. ASA
A. Reflexive Property of Congruence
B. Alternate Interior Angles Theorem
D. Definition of parallelogram
Answer is : parallel. If a transversal intersects two lines in such a way that a pair of alternate interior angles are equal, then the two lines are parallel.
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