Question

in the figure, m is parallel to n and m∠4 = 129°. find the measures of the other angles.

Explanation:

Step1: Use vertical - angle property

Vertical angles are equal. $\angle4$ and $\angle2$ are vertical angles.
$m\angle2=m\angle4$

Step2: Substitute the value of $\angle4$

Given $m\angle4 = 129^{\circ}$, so $m\angle2=129^{\circ}$

Answer:

$129$