Answer:
Statement: Reason:
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1. line DA = line CB 1. It is a parallelogram (two sets of parallel lines)
line DC = line AB
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2. m<b + m<c = 180 degrees 2. Same side Interior Angles Theorem
m<d + m<a = 180 degrees. (If two parallel lines are cut by a transversal,
then the same side interior angles are
supplementary.)