Question

Fill in the blanks :

In the figure :

$\angle AOB$ and ________ form a linear pair.

Answer 1

A linear pair can be defined as two adjacent angles that add up to $180°$ or two angles that form a line or a straight angle when combined together.

As given in the figure below :

So, $\angle 1$ and $\angle 2$ form a linear pair.

Now, as per the question :

$\angle AOB$ and $\angle AOD$are adjacent angles that add up to $180°$. (i.e. $\angle AOB+\angle AOD=90°+90°=180°$)

Hence $\angle AOB$and $\angle AOD$form a linear pair.