The answer is 60. I get this because there are 360 degrees total. You have the angle FGD which is 30 and so the angle directly across from it which is CGE is also 30. Angle AGC has the box in the corner so it is 90 and so that means angle BGD is also 90. So you add up the two 30's and the two 90's which is 240 and then you take 240 away from 360 and you get 120 so you divide 120 by 2 and you get 60 so angle GBD and angle FGA are each 60
