Предмет: Геометрия, автор: Natalia7908

Угол BAC равен 30 градусов,угол DBC равен 70 градусов.Найдите угол BCD

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Автор ответа: Аноним

ВАС и СBD вписанные, значит равны половине дуг, на которых он лежат значит 30+70=100
100×2=200
вся окружность 360, значит 360-200=160
160:2=80

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