A circumference located in the plan $\displaystyle XOY$ have center $\displaystyle C(0,0,0)$ and radius $\displaystyle r > 0$. Determine a parameter for the cylinder formed by all straights that pass by circumference and are parallel to the vector $\displaystyle V(3,0,4)$. Calculate the area of the surface thus obtained, located between plans $\displaystyle \pi 1: z = -4$ and $\displaystyle \pi 2 : z = 4$