Length of paper L = 89 cm, Width of paper W = 44 cm. Cylinder is formed by rolling along the length.

When a rectangle is rolled along one side, the other side becomes the circumference ($2\pi r$) and the side being rolled becomes the height ($h$). Thus, $CSA = \text{Width} \times \text{Length} = 89 \times 44$.

Many students try to calculate the radius and height separately, but the curved surface area of a rolled cylinder is simply the area of the original rectangle.

This concept of 'unfolding' surfaces is crucial for problems involving lateral surface areas of cones and cylinders in 3D geometry.