Question

alguem me ajuda a resolve esse exercício

Answer 1

$a) \: \sin(45) = \frac{x}{3.2} \\ \frac{\sqrt{ 2}}{2} = \frac{x}{3.2} \\ mut \: cruzado \\ 2x = 3.2 \sqrt{2 } \\ x = 1.6 \sqrt{2 } \\ \\ b) \cos(45) = \frac{x}{4} \\ \frac{ \sqrt{2} }{2} = \frac{x}{4} \\ 2x = 4 \sqrt{2} \\ x = 2 \sqrt{2}$