Предмет: Геометрия, автор: 987vno

В треугольнике авс угол с прямой, ас=4, кос а= 0,8. найти ав?

Ответы

Автор ответа: flsh

В прямоугольном ΔABC: AB -- гипотенуза, АС -- прилежащий к <A катет.
По опрделению: cos<A = $frac{AC}{AB}$ . Откуда: АВ = $frac{AC}{cos<A}$ .
АВ = $frac{4}{0,8}$ = 5

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