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Ответ

Ответ дан
Quantum2004

Ответ:57° и 92°

Объяснение:

Угол DAB смежный с улом BAC => угол BAC=180-123=57°

угол B=180°-(57°+31°)=92°

Ответ

Ответ дан
Voronessa

Решение:

∠ВАС=180°-123°=57° - как смежные углы

∠АВС=180°-57°-31°=92° - по теореме о сумме углов треугольника

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