Bom dia, alguma ajuda?
Acho que é para usar a fórmula
Let r be a positive constant. Consider the cylinder and let C be the part of the cylinder that satisfies .
c) Let a be the length of the arc along the base circle of C from the point (r,0,0) to the point (
Let b be the length of the line segment from the point ( to the point . Express a and b in terms of .
d) Calculate the area of the side of C with , and express it in terms of r.