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Answer:

The sum of the interior angles of a triangle is 180°, so m∠B 50° 65° 180°, which means m∠B 65°. Similarly, the three angles on the horizontal line form a straight angle, so m∠2 50° 65° 180°, which means m∠2 65°. Therefore, ∠2 and ∠B are congruent because they have the same measure.