Which pair of angles is complementary?
V
31°
56°
699
340
o

C

Complementary angles have a sum of 90 degrees. So to solve you would add each angle to the other to see if they add up to 90 degrees.

A. 31 + 69 = 100 (does not equal 90, so no)

B. 90 + 90 = 180 (they equal 180, which would be supplementary)

C. 56 + 34 = 90 (they equal 90, therefore they would be the complimentary angles)