Question

determine o valor de x

Answer 1

Cos 45° = cateto adjacente ÷ hipotenusa
Cos45 ° = 8√2 / x
√2 / 2 = 8√2 / x
√2 x = 16√2 ( cancela √2 com√2 )
x = 16

Answer 2

Fórmula:
cosseno = cateto adjacente/hipotenusa

$cos 45 = \frac{8 \sqrt{2} }{x} \\ \frac{ \sqrt{2}}{2} = \frac{8 \sqrt{2} }{x} \\ \frac{ \sqrt{2}}{2} x=8 \sqrt{2} \\ x = \frac{8 \sqrt{2}}{ \frac{ \sqrt{2} }{2} } \\ x= \frac{2.8 \sqrt{2} }{ \sqrt{2} } \\ x=16$

Espero ter ajudado!