12 Given DE bisects ZCDA and 23 21 Prove DE AB Proof 1 2 23 22 3 4 Statements 3 points 1 Given 2 E A 3 D 2 Reasons 3 Transitive Property of Congruence B 4 If two lines are cut by a transversal so that two alternate interior angles are congruent then these lines are parallel