Question

angle fgh is a straight angle.
the measure of angle fgj is 125°.
the measure of angle jgh is x°.
what is the value of x?
x =

Explanation:

Step1: Recall straight angle measure

A straight angle equals $180^\circ$.

Step2: Set up angle sum equation

$\angle FGJ + \angle JGH = 180^\circ$
Substitute known values: $125^\circ + x^\circ = 180^\circ$

Step3: Solve for $x$

$x = 180 - 125$

Answer:

$55$