Final answer:
The measure of arc HG is 154°.
Step-by-step explanation:
To find the measure of arc HG, we need to determine the measure of angle FGH.
We are given that the measure of angle FGH is 77°.
Since angle FGH is an inscribed angle, the measure of the arc it intercepts is twice the measure of the angle. Therefore, the measure of arc HG is 2 times 77°, which is 154°.