Question

if supplementary angles add to 180, complementary angles add to 90, and angles A and B are complementary. Angle A measures 40 degrees, what is the measure of angle B

Answer 1

∠ B = 50°

Explanation:

complementary angles add to 90° , then

∠ A + ∠ B = 90° , that is

40° + ∠ B = 90° ( subtract 40° from both sides )

∠ B = 50°