15问答网 > 一种圆柱形通风管，管口半径5CM，长1．2M，做200根这样的通风管，至少需要铁皮多少平方米？得数保留整平

一种圆柱形通风管，管口半径5CM，长1．2M，做200根这样的通风管，至少需要铁皮多少平方米？得数保留整平

米
2025-04-06 23:16:43
推荐回答（2个）
回答1：

一种圆柱形通风管，管口半径5CM，长1．2M，做200根这样的通风管，至少需要铁皮多少平方米？
5厘米=0.05米
3.14×0.05×2×1.2×200
=0.3768×200
=75.36平方米
≈76平方米（进一法）

回答2：

5cm=0.05m
3.14×0.05×2×1.2×200
=3.14×0.1×240
=0.314×240
=75.36（平方米）
≈76（平方米）
答：至少需要铁皮76平方米

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