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sehingga
a. ∠BOC = 2.∠OAC (sudut pusat dan sudut keliling yang menghadap busur yang sama)
∠BOC = 2.20° = 40°
b. ∠AOC = 180° - ∠OCA - ∠OAC = 180° - 20° - 20° = 140°
c. ∠BOD = ∠AOC (saling bertolak belakang)
∠BOD = 140°