Предмет: Геометрия, автор: alekseevaolga9443

геометрия 8 класс, задание в файле, очень срочно, пожалуйста ((

Приложения:

Ответы

Автор ответа: fatyassirom

Решение:

1. Рассмотрим ∆ABD:

<BAD+<ABD+<ADB=180°.

Отсюда <ADB=180-(30+20)=180-50=130°

Значит, <ADB=130°

2. Вписанные углы, опирающиеся на одну хорду, в сумме составляют 180°, если они лежат по разные стороны хорды:

<ADB+<ACB=180°

<АСВ=180-130=50°

Ответ: 50°

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