If the surface area increases by 25. 12m2, there are two cross-sectional areas equal to 25.12.
That is, the cross-sectional area of the cylinder is 12.56m2,
Calculate the cylinder diameter, 3. 14/4 * d 2 = 12.56, and the diameter D=4m.
The surface area of the original cylinder is s = 25.12+3.14 * 4 *1.8 = 47.728 ≈ 47.73m2..