一块横截面是正方形的长方体木料
- 时间:2020-05-27 19:06:25
- 分类:数学世界
- 阅读:157 次
“桔子香烟”提问:把一块横截面是正方形的长方体木料,削成一个底面最大的圆柱体。底面直径是两分米,高是四分米。求底面削去的面积是多少?这个圆柱体的表面积是多少?
数学题解答:底面削去的面积用正方形面积减去圆的面积就可以了;圆柱体表面积用圆柱的底面积乘高就行了。
底面削去的面积:2×2 - 3.14×(2÷2)×(2÷2)=0.86(平方分米)
圆柱体表面积:3.14×(2÷2)×(2÷2)×4=12.56(立方分米)
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