Question

If m∠A = 81 and m∠B = _______ then they are complementary angles.(a) 99
(b) 19
(c) 81
(d) 9

Answer 1

Complementary means the angles sum to 90 degrees. 90 - 81 = 9 or (d).

Answer 2

Answer:

d) 9

Step-by-step explanation:

m∠A = 81 (Given)

and m∠B = ?

Two angles are said to be complementary when their sum adds up to 90°, which also means a right angle.

Therefore, since ∠A is 81, then

m∠B = 90 - 81

m∠B = 9

Thus, m∠B will be 9°

Therefore, If m∠A = 81 and m∠B = 9 then they will be complementary angles.