Вопрос школьника по предмету Геометрия
1. в треугольнике abc стороны ac и bc равны, угол С равен 120 градусов,угол СВD — внешний. найдите угол CBD
Ответ учителя по предмету Геометрия
находим угол В он равен (180-120):2=30 градусам , угол СВDсмежный с угломСВА значит он равен 180-30=150 градусов
Ответ: угол СВD=150 градусам
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