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Begin the proof by writing the given information inside a box. In this case, since two statements were given, they should be labeled accordingly.
Next, substitute m∠3 for m∠1 into the equation for the sum of the measures. This is justified by the Substitution Property of Equality.
The measures of ∠2 and ∠3 add up to 90∘. Therefore, these angles are complementary.
Notice that the last statement is the desired one. Therefore, the proof is complete!