Question

How many pairs of adjacent angles are formed when two lines intersect at a point?​

Answer 1

Let two lines $AB$ and $CD$ intresect at point $O$.
The pair of adjacent angles are:

$(\angle AOD,\angle DOB),(\angle BOC,\angle COA),(\angle COA,\angle AOD)\text{and}(\angle DOB,\angle BOC)$

Hence , $4$ pairs of adjacent angle are formed when two lines intersect at a point.