Луч OB делит угол ∠AOС. ∠AOС= 120°. Найти: ∠BOC, если: а) ∠AOВ : ∠BOC = 3 : 5
б) ∠AOВ > ∠BOC на 20°
в) ∠AOВ > ∠BOC в 5 раз
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