September 2021 0 10 Report
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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