The height of a cylinder is 8cm, and the circumference of its bottom is 25.12cm. It is cut vertically along its diameter, and the surface area increases ()

The height of a cylinder is 8cm, and the circumference of its bottom is 25.12cm. It is cut vertically along its diameter, and the surface area increases ()

The increased surface area is the area of two rectangles (one on each side) added after cutting
One side of a rectangle is equal to the height of the cylinder, and one side is equal to the diameter
Therefore, the diameter is 25.12 / 3.14 = 8
8x8x2 = 128 square centimeters