Answer:
40*
Step-by-step explanation:
the whole line FC would measure 180* so then 180-50 for AGC then AGB is congruent to EGD so 180-50-90---> 130-90---> 40* so angleBGC is 40 degrees
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624 divided by 8 = 78
I believe the radius is half the circle which makes the diameter 2x the radius which is 35+35= 70