If the radius of the bottom of a cylinder increases by 2 cm, its side area will increase by 62.8 square meters. If the perimeter of its bottom increases by 2 cm, how many square centimeters will its side area increase?

If the radius of the bottom of a cylinder increases by 2 cm, its side area will increase by 62.8 square meters. If the perimeter of its bottom increases by 2 cm, how many square centimeters will its side area increase?

62.8 ÷ (2 × 2 × 3.14), = 62.8 ÷ 12.56, = 5 (CM), 2 × 5 = 10 (square cm); a: its side area increases by 10 square cm