Question

Which is complementary

Answer 1

Two complementary is 90 degrees. So the answer is B.

Answer 2

Complementary angles are angles which add up to 90 degrees.

If we observe each given angle pairs given carefully onto the diagram provided, we can see that SXT and TXU are complementary, as when we add up their angles: 

25 + 65 = 90

Since SXT and TXU add up to 90 degrees, we can confirm that this is indeed the answer. Therefore, B.

Hope this helped!