Question

given line m is parallel to line n. what theorem or postulate justifies the statement? ∠1≅∠4 corresponding angles postulate linear pair postulate vertical angles theorem alternate interior angle theorem

Explanation:

When two parallel lines are cut by a transversal, vertical - angles are congruent. ∠1 and ∠4 are vertical angles. The vertical - angles theorem states that vertical angles are congruent.

Answer:

Vertical angles theorem