To forge a conical part with a base circumference of 62.8 cm and a height of 12 cm, it is necessary to cut how long a square steel with a base circumference of 4 cm is used as raw material

Cone radius = 62.8 △ 2 △ 3.14 = 10 cm
Cone volume
=1 / 3 × 3.14 × 10, 178; 12
=1256 CC
Side length of square bottom = 4 △ 4 = 1cm
Intercept length required
=1256÷（1×1）
=1256 cm

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