Предмет: Геометрия, автор: vika19998Б

В треугольнике АВС угол С прямой, ВС=2, cosB=0,4. Найдите АВ

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Автор ответа: eminova1998

cos-это отношение прил катета г гипотенузе,то
cosB=bc/ab
0.4=2/x(x-это сторона ab)x=5
Ответ:Ab=5

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