[tex]\Large\boxed{\begin{array}{l}\sf sen(45^\circ)=\dfrac{3\sqrt{2}}{x}\\\sf\dfrac{\backslash\!\!\!\!\sqrt{2}}{2}=\dfrac{3\backslash\!\!\!\!\sqrt{2}}{x}\\\\\sf x=2\cdot3\\\sf x=6\end{array}}[/tex]
