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58问答库 > 一个圆柱形铁皮油桶，底面直径是40cm，高50cm，做这个油桶要用多少平方分米的铁皮?

一个圆柱形铁皮油桶，底面直径是40cm，高50cm，做这个油桶要用多少平方分米的铁皮?

如果一升油重0.85千克，这桶油重多少千克

2025-04-07 08:30:51

推荐回答（1个）

回答（1）：

做油桶需要的铁皮即为求圆柱表面积。圆柱表面积=底面+顶面+圆柱柱身=π*20*20+π*20*20+π*40*50=2800π平方厘米=28π平方分米

里面装的油即为圆柱体积。体积=底面积*高=π*20*20*50=20000π立方厘米=20π立方分米=20π升
一升0.85千克，油重20π*0.85=17π千克

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