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X = AB = 2R = 5

X = DF = 4

Blue Area = 864 / 5 = 172.8

Missing Angle BIF = 90

X = BE = BG = 2.07055236082

X = BAD = 45

Proof that a = b = c

Orange Area = 24.3600700663

Blue Area ≤ 70 / 3

a / b = 1.61803398875