Obviously, two ways can be adopted if one wants to give the rectangular piece of paper a cylindrical form, i.e., 1. When the paper is bent towards its length. In this case, the circumference of the base of the cylinder will be equal to the length of the rectangular piece of paper and the height of the cylinder will be equal to the breadth of the rectangular piece of paper. 2. When the paper is bent towards its breadth. In this case, the circumference of the base of the cylinder will be equal to the breadth of the rectangular piece of paper and the height of the cylinder will be equal to the length of the rectangular piece of paper.