Question

given $m\parallel n$, find the value of x.

Explanation:

Step1: Identify supplementary angle

The angle adjacent to $168^\circ$ is $180^\circ - 168^\circ = 12^\circ$.

Step2: Use parallel lines property

Since $m \parallel n$, $x$ equals the $12^\circ$ angle (corresponding angles are equal).

Answer:

$12$