A cylindrical steel pipe, with an inner diameter of 4cm and an outer diameter of 8cm, is 6m long and weighs 7.8G per cubic centimeter. How many kg does this steel weigh?

Inner radius: 4 △ 2 = 2 (CM) outer radius: 8 △ 2 = 4 (CM) 6 m = 600 cm bottom area of steel pipe: 3.14 × 42-3.14 × 22 = 3.14 × 12 = 37.68 (square cm) volume of steel pipe: 37.68 × 600 = 22608 (cubic cm) weight of steel pipe: 22608 × 7.8 = 176342.4 (g) = 176.3424

The bottom of a cone is 8 cm in diameter and 4 cm in height. Its volume is cubic centimeter. The volume of a cylinder with the same height as its bottom is cubic centimeter?

Volume = 1 / 3 × 3.14 × (8 / 2) & # 178; × 4 = 66.99 cm3
The volume of the cylinder with equal base and height is 66.99 × 3 = 200.96 cubic centimeter

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