In order to forge a conical part with a bottom diameter of 40 cm and a height of 30 cm, how many cm of cylindrical steel with a diameter of 20 cm need to be cut?

Volume of conical part: 1 / 3 × 3.14 × (40 / 2) × (40 / 2) × 30 = 12560 cm3
The bottom area of cylindrical steel with a diameter of 20 cm is: 3.14 × (20 / 2) × (20 / 2) = 314 square cm
Need to intercept: 12560 △ 314 = 40cm

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