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Теорема

Сумма углов треугольника равна \(180\degree \) .

В \(\triangle ABC\)

\(\angle A+\angle \) [ ] \(+\,\angle C=\) [ ] \(\degree \) .

В треугольнике \(ABC\) найди:

1. \(\angle A\) , если \(\angle B=37\degree \) и \(\angle C=72\degree \) ;

2. \(\angle B\) , если \(\angle A=117\degree \) и \({\angle C=23\degree }\) ;

3. \(\angle C\) , если \(\angle A=43\degree \) и \(\angle B=47\degree \) .

Ответ: 1) \(\angle A=\) [ ] \(\degree \) ; 2) \(\angle B=\) [ ] \(\degree \) ; 3) \(\angle C=\) [ ] \(\degree \) .