∡ABF = 80° - - - > ∡ABC = 180°-80° = 100°
∡BAC = ∡BCA = (180°-100°) / 2 = 40°
∡OAC = ∡OCA = 40°/2 = 20°
∡AOC = 180°-20°-20° = 140°
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∡ABF = 80° - - - > ∡ABC = 180°-80° = 100°
∡BAC = ∡BCA = (180°-100°) / 2 = 40°
∡OAC = ∡OCA = 40°/2 = 20°
∡AOC = 180°-20°-20° = 140°