The measure of an angle is 3/4 of 60 degrees. what is the measure of the complementary angle?

First we can convert the fraction into a decimal which would be 0.75. Then we continue to multiply  0.75 by 60 which would then give us the answer. 0.75*60=45 degrees We can prove this by dividing 90/2 which equals 45 because 2 complementary angles add up to 90 degrees. 45 degrees is the final answer. Hope this helps!

a. is correct