Предмет: Математика, автор: katyamalcheva

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Автор ответа: RRRBBB

1

Так как OA = OC и OB = OD (по условию задачи), то ABCD - параллелограмм (по признаку параллелограмма). Следовательно, угол BDC = углу ABD = 67° (накрест лежащие углы при параллельных прямых и секущей). Отсюда находим угол ADC = 47° + 67° = 114°.

Ответ: 114°.

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