Предмет: Геометрия, автор: dendemin

Помогите 1 номер пожалуйста

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Автор ответа: Аноним

0

по свойству пересекающихся хорд АР*РС=ВР*РD⇒АР=ВР*РD/РС,

АР=4*21/12=7,

Ответ 7

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