Question

The complement of ${80}^o$ is:

• A. ${100}^o$
• B. ${10}^o$
• C. ${20}^o$
• D. ${280}^o$

Answer 1

The correct option is B ${10}^o$

Two angles are said to be complementary, if the sum of their measures is ${90}^o$.

The given angle is ${80}^o$.

Let the measure of its supplement be $x^o$.

Then,

$⟹x^o+{80}^o={90}^o$

$⟹x={90}^o-{80}^o$

$⟹x={10}^o$.

Hence, the supplement of the given angle measures ${10}^o$.

Therefore, option $B$ is correct.