Question

The distance between two point $(x_1,y_1)$ and $(x_1,y_2)$ on a line parallel to $Y$-axis is:

Answer 1

Since, the $x$-coordinate of both points is same, it means both point lies on a line which is parallel to $y$-axis.
$\therefore$ the distance between both points on a line parallel to $Y$-axis $=|y_2-y_1|$