Question

Find the complement of each of the following angles ${20}^{\circ }$.

• A. ${70}^{\circ }$
• B. ${60}^{\circ }$
• C. ${110}^{\circ }$
• D. None of these

Answer 1

The correct option is A ${70}^{\circ }$

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

Given, measure of one complementary angle is ${20}^o.$

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

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

Therefore, option $A$ is correct.