Предмет: Математика, автор: chesnokovanika11

в4 позязя срочно!! развернуто​

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Ответы

Автор ответа: Ilya5413
1

Ответ:

60° , 12 см

Пошаговое объяснение:

Внутренний угол В равен :

∠В = 180 - 120 = 60° (по определению смежных углов)

∠В = ∠С ⇒

∠А = 180 - 60 - 60 = 60° ⇒

ΔАВС - равносторонний. ⇒

АМ - высота, медиана и биссектриса (по свойству высоты высот, медиан и биссектрис в равностороннем треугольнике). ⇒

МС=МВ = 6 ⇒

СВ = 6+6 = 12 ⇒

АВ=СВ = 12  см

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