The circumference of the bottom of the cylinder is 25.12cm, and it is cut in half along the diameter of the bottom. The surface area of the cylinder is increased by 112 square cm

The circumference of the bottom of the cylinder is 25.12cm, and it is cut in half along the diameter of the bottom. The surface area of the cylinder is increased by 112 square cm


25.12 / 3.14 = 8 cm (bottom diameter)
112 / 2 / 8 = 7 cm (height of cylinder)
25.12 * 7 = 175.84 square centimeter (side area)
8 / 2 = 4cm (radius)
3.14 * 4 * 4 = 50.24 square centimeter (bottom area)
50.24 * 2 + 175.84 = 276.32 square centimeter (surface area)