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Автор - artemiy17012003

Помогите, пожалуйста)

Ответ

Автор - Olga8128

Ответ: г). √ 10 .

Решение:

В этом случае можно воспользоваться теоремой косинусов:

c=sqrt{a^2+b^2-2ab*cosalpha } = sqrt{2^2+sqrt{2}^2-2*2*sqrt{2}*cos135 textdegree} = \\sqrt{4+2-4sqrt{2}*(-frac{sqrt{2} }{2})} = sqrt{6-(-frac{4sqrt{2} sqrt{2} }{2})}=sqrt{6+frac{4*2}{2} } =sqrt{6+4} = sqrt{10} .

Задача решена!

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