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The surface area of a 1-meter-long steel cylinder will be reduced by 25.12 square decimeters after a 2-decimeter section is cut off. The volume of this steel cylinder is______ Cubic decimeter
Because the side area = the perimeter of the bottom surface × the height & nbsp; & nbsp; & nbsp; so the perimeter of the bottom surface = the perimeter of the side surface △ the height = 25.12 △ 2 = 12.56 (decimeter) & nbsp; because the perimeter of the circle C = 2 π R & nbsp; so r = C △ 2 π = 12.56 △ 2 × 3.14 = 2 (decimeter) & nbsp; 1 meter = 10 decimeter v = sh = 3.14 × 22 × 10 =
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