Question

Determine a medida de x em cada caso:
(obs: sen90°= 1, cos90°= 0
​

Answer 1

Se trabalharmos com a tangente, obteremos:

$tg60\°=\frac{9}{x}\\\sqrt{3}=\frac{9}{x}\\x\sqrt3=9\\x=\frac{9}{\sqrt3}.\frac{\sqrt3}{\sqrt3}\\x=\frac{9\sqrt3}{3}\\x=3\sqrt3$