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= 2 × 20°
= 40°
b) ∠AOC = 180 - 40
= 140°
c) ∠BOD = ∠AOC = 140°
2. a) ∠AOB = 2 × ∠ ACB
= 2 × 25
= 50°
b) ∠OAB = (180 - 50) / 2
= 130 / 2
= 65°
c) ∠BAC = 65 + 15
= 80°