Question

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

Answer 1

Let two lines $AB$ and $CD$ intersect at point $Q$.



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 angles are formed when two lines intersect at a point.