Question

Which among these are complementary angles?

(a) ∠A + ∠B = 90°

(b) ∠A + ∠B = 180°

(c) ∠A + ∠B = 60°

(d) ∠A + ∠B = 45°

This question was posed to me during an online interview.

This question is from Trigonometric Ratios of Complementary Angles in portion Trigonometry of Mathematics – Class 10

Answer 1

Right choice is (a) ∠A + ∠B = 90°

Easiest explanation: Two angles are said to be complementary angles if the sum of these two angles is 90° but if the sum of these two angles is 180° then these two angles are said to be supplementary.