What is the length of a rectangle formed from the lateral surface of a cylinder?

The solid enclosed by this surface and by two planes perpendicular to the axis is called a cylinder. The cylinder has a round base and a perpendicular height. Surface area of a cylinder is the sum of surface area of each end of the cylinder and the surface area of the sides. The surface area of a cylinder depends on whether a cylinder is without a top or bottom, or can, which has both top and bottom.