Предмет: Геометрия, автор: viktoriaamigo

В прямоугольном треугольнике один из катетов равен 9 см,а косинус прилежащего к нему угла равен 0.75.Чему равна длина гипотенузы ?
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Автор ответа: VladMath

0

$cos alpha = frac{a}{c}$
где a - прилежащий катет, c - гипотенуза.
Отсюда $c = frac{a}{cos alpha } = frac{9}{0,75} = 12$

Ответ: 12

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