Question

first, find ( mangle khl ).
( mangle khl = 129 ).
now, find ( mangle lhm ).
( mangle lhm = 51 ).
finally, find ( mangle mhj ).
( mangle mhj = )

Explanation:

Step1: Identify vertical angles

Vertical angles are equal. $\angle MHJ$ and the angle of $51^{\circ}$ are vertical angles.

Step2: Calculate the measure

Since vertical angles are equal, $m\angle MHJ = 51^{\circ}$.

Answer:

$51$