已知圆锥的底面圆周在球O的表面上,顶点为球心O,圆锥的高为3,且圆锥的侧面展开图是一个半圆,则球O的体积为( )
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更新时间:2024-05-10 22:40:54
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【推荐1】若一几何体的三视图如图所示(单位网格),则该几何体的表面积为( )
![](https://img.xkw.com/dksih/QBM/2022/3/25/2944071195123712/2958211477569536/STEM/d685b555-b7a8-44ae-88fc-4b3754039366.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2022/3/25/2944071195123712/2958211477569536/STEM/d685b555-b7a8-44ae-88fc-4b3754039366.png?resizew=200)
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【推荐2】下列说法中正确的个数是
①圆锥的轴截面是等腰三角形;②用一个平面去截棱锥,得到一个棱锥和一个棱台;③棱台各侧棱的延长线交于一点;④有两个面平行,其余各面都是四边形的几何体叫棱柱.( )
①圆锥的轴截面是等腰三角形;②用一个平面去截棱锥,得到一个棱锥和一个棱台;③棱台各侧棱的延长线交于一点;④有两个面平行,其余各面都是四边形的几何体叫棱柱.( )
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【推荐1】已知
是球
的直径
上一点,
,
平面
,
为垂足,
截球
所得截面的面积为
,则球
的体积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc9d89c425ca5ceb0fa490ec7a93e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐2】已知棱长为3的正四面体
的内切球球心为
,现从该正四面体内随机取一点
,则点
落在球
内的概率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐1】【河南省洛阳市2018届三模】在三棱锥
中,
平面
,
,
,
,
是边
上的一动点,且直线
与平面
所成角的最大值为
,则三棱锥
的外接球的表面积为( )
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/6409d4346d9f4760b0f6ee8e7f25d4a9.png?resizew=53)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/8219c3804d8248e8a6819a7c1fbdcab7.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/3a2c35c83db544c3b1cd70ed7e9de52d.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/99720413d09f44e39b93265e388d7419.png?resizew=67)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/0c22ed5ff6a44c10823dd90a87189d05.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/ccc46a28c9f14eb9a1a8e5932d865185.png?resizew=61)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/af9308b395a349cb8dadf6664361d9a6.png?resizew=10)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/4000b65d94864c3599a625bb1db1e1e2.png?resizew=18)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/e50cc4cf6bab4d269117b0b4d4c06be3.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/3a2c35c83db544c3b1cd70ed7e9de52d.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/793c591ef73248e28d08b70d5da37837.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/7/2/1979752375074816/1981336797560832/STEM/6409d4346d9f4760b0f6ee8e7f25d4a9.png?resizew=53)
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【推荐2】《九章算术》中将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的四面体称之为鳌臑.在鳌臑
中,
平面
,
,
,鳌臑
的四个顶点都在同一个球上,则该球的体积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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