Answer
Angles F and C are congruent.
Step-by-step explanation
First you have to know that angles in a straight line add up to 180°
∴ A+F+E = 180°
Also corresponding angles are equal.
∴ H = A
G = E
Direct opposite angles are equal. That is C = F.
This means that Angles F and C are congruent.
With this prove, we can conclude that;
G+C+H = 180°
G, C, and H are interior angles and they add up to 180°