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Stacy713
@Stacy713
August 2022
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В треугольнике СВ=5 см, AC=4см, угол ACB=60 градусов. Найти: АВ.
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Universalka
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По теореме косинусов :
AB² = BC² + AC² - 2 * BC * AC * Cos < C =5² + 4² - 2 * 5 * 4 * Cos60° =
= 25 + 16 - 40 * 1/2 = 41 - 20 = 21
AB = √21 см
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Answers & Comments
Verified answer
По теореме косинусов :AB² = BC² + AC² - 2 * BC * AC * Cos < C =5² + 4² - 2 * 5 * 4 * Cos60° =
= 25 + 16 - 40 * 1/2 = 41 - 20 = 21
AB = √21 см