The side of the cylinder is square, and the length of the back side is 15.7cm when it is unfolded along the height, so the perimeter of the bottom surface = height = 15.7 cm.

The bottom radius is

15.7 ÷ 3. 14 ÷ 2 = 2.5 (cm)

The bottom area is

2.5× 2.5× 3.14 =19.625 (square centimeter)

The transverse area is

15.7× 15.7 = 246.49 (square centimeter)

The surface area is

19.625× 2+246.49 = 285.74 (square centimeter)