В треугольнике ABC угол C равен 90°. BC=2[tex] \sqrt{15} [/tex] , AB= 8. Найдите CosA. Created by dima200214. geometriya-ru

Найдем по теореме Пифагора AC.Ответ: 0,25.

tex] , AB= 8. Найдите CosA...

dima200214 @dima200214

July 2022 1 14 Report

В треугольнике ABC угол C равен 90°. BC=2[tex] \sqrt{15} [/tex] , AB= 8. Найдите CosA

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Dимасuk

Verified answer

Найдем по теореме Пифагора AC.
$AC = \sqrt{ 8 ^{2}- (2\sqrt{15})^{2} } = \sqrt{64 - 4*15} = \sqrt{4} = 2$
$cosA = \frac{AC}{AB} = \frac{2}{8} = \frac{1}{4} = 0,25.$
Ответ: 0,25.

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