Question

∠A and ∠B are complementary. The measure of ∠A is 21°.

What is the measure of ∠B?

Enter your answer in the box.

Answer 1

<B be y

• We know that complementary angles have sum 90°

`\\ \sf\longmapsto y+21=90`

`\\ \sf\longmapsto y=90-21`

`\\ \sf\longmapsto y=69°`

<A=69°

Answer 2

The measure of ∠B is 69°

Explanation:

Given :

=> ∠A + ∠B = 90°

=> 21° + ∠B = 90°

=> ∠B = 90°- 21°

=> ∠B = 69°