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85问答库 > 把一个圆柱地面平均分成若干个扇形,沿高切开拼成一个近似长方体,这个长方体的底周长是8.28厘米，高5厘米

把一个圆柱地面平均分成若干个扇形,沿高切开拼成一个近似长方体,这个长方体的底周长是8.28厘米，高5厘米

2025-04-07 08:16:47

推荐回答（2个）

回答1：

长方体的周长就是圆柱的周长。长方体的高就是圆柱的高。
圆柱表面积=底面积×2＋侧面积
两个底面积∶﹙8.28÷3.14÷2﹚²×3.14×2=6.28cm²
侧面积∶8.2×5=41cm²
圆柱表面积∶41+6.28=47.28cm²

回答2：

长方体的底周长等于圆柱底面周长加上直径
假设圆柱底面半径为r
2*3.14*r+2r=8.28
r=8.28/(2*3.14+2)=1厘米
所以圆柱的表面积=2*3.14*1*5+2*3.14*1^2=37.68平方厘米

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