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aciddropking11
@aciddropking11
July 2022
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В треугольнике ABC дано: AB = 7, AC = 8, cosA = -31/112
Найдите сторону BC.
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IrkaShevko
Verified answer
По теореме косинусов:
BC² = AB² + AC² - 2*AB*AC*cosA
BC² = 49 + 64 + 56*31/56 = 113 + 31 = 144
BC = 12
Ответ: 12
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aciddropking11
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Answers & Comments
Verified answer
По теореме косинусов:BC² = AB² + AC² - 2*AB*AC*cosA
BC² = 49 + 64 + 56*31/56 = 113 + 31 = 144
BC = 12
Ответ: 12