在等腰直角
中,三内角A,B,C所对的边分别为a,b,c,
,分别以a,b,c三边为轴将三角形旋转一周所得旋转体的体积分别记为
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aebec30356b590a72bc2a75f9b09221.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e29d496af9b75c1cba59c089ffb1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d257782662b2fc1658523ea79d0d15.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1b5b90f8b57c6dfce989eec11fdf94.png)
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更新时间:2021-05-30 18:47:41
|
【知识点】 求旋转体的体积
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【推荐1】在
中,
,
,若将
绕直线BC旋转一周,则所形成的旋转体的体积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】Paul Guldin(古尔丁)定理又称帕普斯几何中心定理,其内容为:面积为S的封闭的平面图形绕同一平面内且不与之相交的轴旋转一周产生的曲面围成的几何体,若平面图形的重心到轴的距离为d,则形成的几何体体积V等于该平面图形的面积与该平面图形重心到旋转轴的垂线段为半径所画的圆的周长的积,即
.现有一工艺品,其底座是
绕同一平面内的直线
(如图所示)旋转围成的几何体.测得
,
,
,上口直径为36cm,下口直径56cm,则该底座的体积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/bba966c5-4fa5-4b8e-8fa5-e1ef2acb0422.png?resizew=135)
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【推荐3】祖暅(公元5-6世纪),祖冲之之子,是我国齐梁时代的数学家.他提出了一条原理:“幂势既同,则积不容异.”这句话的意思是:两个等高的几何体若在所有等高处的水平截面的面积相等,则这两个几何体的体积相等.该原理在西方直到十七世纪才由意大利数学家卡瓦列利发现,比祖暅晚一千一百多年.椭球体是椭圆绕其轴旋转所成的旋转体.如图将底面直径皆为
,高皆为a的椭半球体及已被挖去了圆锥体的圆柱体放置于同一平面
上.以平行于平面
的平面于距平面
任意高d处可横截得到
及
两截面,可以证明
总成立.据此,短轴长为
,长轴为
的椭球体的体积是( )![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6d1d99afa158b4ba4fc0dae562fcc1.png)
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