Question

look at this diagram: if $overleftrightarrow{gi}$ and $overleftrightarrow{jl}$ are parallel lines and $mangle lkm = 129^{circ}$, what is $mangle ihk$?

Explanation:

Step1: Identify angle - relationship

$\angle LKM$ and $\angle IHK$ are vertical - angles.

Step2: Recall vertical - angle property

Vertical angles are congruent, i.e., if two angles are vertical angles, they have the same measure.

Answer:

$129$