Question

Let measure angle A equal 40. If angle B complement of angle A, and angle C is a supplemlement of angle B find these measures

Answer 1

Two angles are complementary when they add up to 90 degrees 
m∠B = 90° - m∠A = 90° - 40° = 50°

Two angles are supplementary when they add up to 180 degrees 
m∠C = 180° - m∠B = 180° - 50° = 130°