If angle A has a measurement of 42° and is complementary to angle B, what's the measure of angle B?

A. 48°

B. 42°

C. 38°

D. 138°

The answer to the question is A. 48 degrees. In a complimentary angle, both of the angles have to add up to 90 degrees. For this case, with 42 degrees, the complimentary would be 48 degrees as they both add up to 90 degrees in the problem presented above.