Question

What do you mean by linear pair of angles?

Answer 1

Define linear pair of angles:

When two lines cross at a single point, a linear pair of angles is generated. If the angles are adjacent to each other they are considered to be linear.

A linear pair's sum of angles is always $180$ degrees.

Supplementary angles are another name for these types of angles.

In the below figure, $\angle AOP\mathrm{and}\angle BOP$ form linear pair and $\angle AOP+\angle BOP=180°$.

Hence, Linear pair is a pair of adjacent angles where the non-common side forms a straight line.