Question

Two angles are called ________ angles, if the sum of their measures equals ${180}^o$.

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

Answer 1

The correct option is B supplementary

Two angles are called supplementary angles, if the sum of their measures equals ${180}^o$.

For example:

Here, the angles are ${120}^o$ and ${60}^o$.
The sum of these two angles are ${120}^o+{60}^o={180}^o$
So, ${120}^o$ and ${60}^o$ are supplementary angles.