Question

If sum of two angles is ${90}^o$. They will be:

• A. Linear pair
• B. Supplementary angles
• C. Complementary angles
• D. Corresponding angles

Answer 1

The correct option is C Complementary angles

By definition we know that two angles, the sum of whose measure is ${90}^o$ are called complimentary angles.

Then, such angles are called complement of each other.

E.g.: Let the measure of one complementary angle is ${58}^o.$

$\Rightarrow$ Measure of other complementary angle $={90}^o-{58}^o$ $={32}^o.$

$\therefore$ Measure of the complementary angle of ${58}^o={32}^o$.

Hence, ${58}^o$ and ${32}^o$ are complements of each other.

That is, if the sum of two angles is ${90}^o$

Therefore, option $C$ is correct.