Question

Find the measure of the complementary angle of ${77}^o$.

• A. ${43}^o$
• B. ${70}^o$
• C. ${47}^o$
• D. ${13}^o$

Answer 1

The correct option is D ${13}^o$

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

Given, measure of one complementary angle is ${77}^{\circ }$.

$\Rightarrow$ Measure of other complementary angle $={90}^o-{77}^o$ $={13}^o.$

$\therefore$ Measure of a complementary angle of ${77}^o={13}^o$.

Therefore, option $D$ is correct.