How to increase the surface area of a one meter long cylindrical steel with a bottom diameter of 2 decimeters? It's simple To be more specific, why

How to increase the surface area of a one meter long cylindrical steel with a bottom diameter of 2 decimeters? It's simple To be more specific, why

Surface area increase: 2 x 3.14 x 1 x 1 = 6.28 square decimeters
Add two end faces at the cut-off, and the area of each end face is equal to the area of the bottom!