Write a formal proof of the following theorem. If two parallel lines are cut by a transversal, then the pairs of alternate exterior angles are congruent. Given: ---Select--- Prove: ---Select--- Statements | Reasons 1. ---Select--- | 1. ---Select--- 2. ---Select--- | 2. If two || lines are cut by a transversal, corresponding ?s are ?. 3. ---Select--- | 3. ---Select--- 4. ---Select--- | 4. ---Select--- ? ---Select--- If two lines intersect, vertical ?s formed are ?. Transitive Property of Congruence Given ? ---Select--- ?1 ? ?3 ? || m; transversal t ?3 ? ?2 ?1 ? ?2
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