Ответы 1
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Δ DEB, DE = BE, значит треугольник равнобедренный и углы при основании равны, <BDE = <DBE = 60°. <DBE и <CBE - смежные. Значит <CBE = 180° - 60° = 120°. Из условных обозначений на рисунке следует, что <ABC = <EBA = 120° : 2 = 60°. Каждый из искомых углов 60°.
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Автор:
dylanuoy3 - 5 лет назад
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