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116问答网 > 一根圆柱形钢管的外直径10cm，管壁厚2cm，长4cm，这根钢管所用的体积是多少？

一根圆柱形钢管的外直径10cm，管壁厚2cm，长4cm，这根钢管所用的体积是多少？

2025-03-16 05:15:07

推荐回答（4个）

回答1：

外直径10cm，管壁厚2cm，则内径=10-2=8cm底面积=3.14*（10*10-8*8）=113.04cm2体积=113.04*4=452.16立方厘米

回答2：

看出一个大圆柱剪切一个小圆柱
大圆柱半径为10/2=5cm，体积为5x5xπx4=100π
小圆柱管壁厚2cm，所以半径为5-2=3cm，体积为3x3xπx4=36π
所以体积为100π-36π=64π

回答3：

10÷ 2=55+2=7体积为：大圆柱的体积-空心部分圆柱的体积3.14X(7的平方-5的平方)X4=3.14X24X4=301.44(立方厘米)

回答4：

大圆柱的体积-小圆柱的体积=7*7*3.14*4-5*5*3.14*4=301.44立方厘米

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