If the height of a cylinder is reduced by one centimeter, its side area will be reduced by 6.28 square centimeter

If the height of a cylinder is reduced by one centimeter, its side area will be reduced by 6.28 square centimeter

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Bottom perimeter: 6.28 △ 1 = 6.28 (CM)
Bottom radius: 6.28 △ 3.14 △ 2 = 1 (CM)
Original volume: 3.14 × 1 × 6.28 = 19.7192 (cm3)