Question

Two angles are called ______ angles if the sum of their measures equals 90°.

• A. supplementary
• B. complementary
• C. right
• D. straight

Answer 1

The correct option is B complementary

Two angles are called complementay angles if the sum of their measures equals 90°.

For example:
Here, $\angle AOD={30}^o$ and $\angle DOB={60}^o$.
$\angle AOD+\angle DOB={30}^o+{60}^o={90}^o$

So. $\angle AOD$ and $\angle DOB$ are complementary angles.