In order to forge a cylindrical part with a circumference of 62.8cm and a height of 15cm, how long is the square steel with a circumference of 4 decimeters?

Part volume: 3.14 × (62.8 △ 3.14 △ 2) ^ 2 × 15 = 4710 (cm3)
Side length of square steel: 4 △ 4 = 1 (decimeter) = 10 (CM)
Need to intercept: 4710 ÷ (10 × 10) = 47.1 (CM)

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