Question

Find the measure of the complementary angle of each of ${20}^o$.

• A. ${50}^o$
• B. ${70}^o$
• C. ${160}^o$
• D. ${80}^o$

Answer 1

The correct option is B ${70}^o$

We know, two angles are complementary when they add up to ${90}^o.$

Given, measure of one complementary angle is $={20}^{\circ }$.

$\Rightarrow$ Measure of other complementary angle $={90}^o-{20}^o$ $={70}^o.$

$\therefore$ Measure of a complementary angle of ${20}^{\circ }$ $={70}^{\circ }$.

Therefore, option $B$ is correct.