Question

The sum of angles forming a linear pair is:

• A. ${90}^o$
• B. ${180}^o$
• C. ${360}^o$
• D. None of the above

Answer 1

The correct option is B ${180}^o$

$\underset{–}{\text{Linear Pair:}}$
Pair of adjacent angles whose non-common sides form a straight line and their measures add up to ${180}^o$.

In the below figure, $\angle 1$ and $\angle 2$ form a linear pair.

It is clear from the definition that the sum of angles forming a linear pair is ${180}^o$.

So, option(b.) is correct.