ABCD is a parallelogram Select the true statements used to prove that opposite angles of a parallelogram are congruent Select two A D a B Y 50 8 B C Za Zy because same side interior angles are congruent when a transversal crosses parallel lines La 28 because alternate interior angles are congruent when a transversal crosses parallel lines AABD ACDB by the side angle side congruence criterion AABD ACDB by the angle side angle congruence criterion 28 28 because same side interior angles are congruent when a transversal crosses parallel lines