Answer:
60 = x
Step-by-step explanation:
You know that Angle FGC is 30 degrees, because of vertical angles. Because DGC is 90 degrees, this means BGC is also 90 degrees (because BGD is a line). This means that x + Angle FGC = 90 degrees. We found out that Angle FGC = 30 degrees, so x + 30 = 90. This means x = 60
