Question

calcule o x e y triângulos da figura

Answer 1

Temos que utilizar as razões trigonométricas para resolver esse exercício. Para 40º, a gente tem:

$sen\,40\degree\approx0,643\\\\cos\,40\degree\approx0,766$

$sen\,40\degree=\dfrac{y}{8}\\\\0,643=\dfrac{y}{8}\\\\ \boxed{y=5,14\,uc}\\\\\\\\cos\,40\degree=\dfrac{x}{8}\\\\0,766=\dfrac{x}{8}\\\\ \boxed{x=6,13\,uc}$