三棱锥
的平面展开图如图所示,已知
,若三棱锥
的四个顶点均在球
的表面上,则球
的表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd9f16a5c7a66e62e52fd66f4449ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4549f7bbb8d26fbcf2c1945a99ecb2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd9f16a5c7a66e62e52fd66f4449ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982881279664128/2984036362305536/STEM/cdacb304-a7cd-43a5-8d9b-ae9593ae8177.png?resizew=238)
2022·山西吕梁·三模 查看更多[3]
更新时间:2022-05-21 09:40:25
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【推荐1】正三棱柱
中,所有棱长均为2,点
、
分别为棱
、
的中点,若过点
、
、
作一截面,则截面的周长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】正三棱柱
中,所有棱长均为2,点E,F分别为棱
,
的中点,则直线EF与直线BC所成角的余弦值为_______ ;若过点A,E,F作一截面,则截面的周长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
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【推荐1】用两个平行平面去截球体,把球体夹在两截面之间的部分称为球台.根据祖暅原理(“幂势既同,则积不容异”),推导出球台的体积
,其中
分别是两个平行平面截球所得截面圆的半径,
是两个平行平面之间的距离.已知圆台
的上、下底面的圆周都在球
的球面上,圆台
的母线与底面所成的角为
,若圆台
上、下底面截球
所得的球台的体积比圆台
的体积大
,则球O的表面积
与圆台
的侧面积
的比值
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cbb6f33f82a6e40c2b76d950d7e318a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8543261a8e351eb95cdfebb001a3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e95a79288fcb7e47fba4410722e2bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
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【推荐2】如图,已知三棱柱
,底面
是边长为
的等边三角形,
在底面
的射影是
的中心,且
为
的中点,
在线段
上且
,过点
作三棱柱的截面
,若
交
于点
,则三棱锥
外接球的表面积是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870b24743f701bd898c0cba1f7c5aee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐1】将3个4cm×4cm的正方形都沿其中的一对邻边的中点剪开,每个正方形均分成两个部分,如图(1)所示,将这6个部分接于一个边长为
的正六边形上,如图(2)所示.若将该平面图沿着正六边形的边折起,围成一个七面体,则该七面体的体积为________
;若在该七面体内放置一个小球,则小球半径的最大值为_________ cm.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c076056906cd59f7c4f782a4db28d907.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/29f9f54f-d369-4ec0-b115-b53ad720fce6.png?resizew=128)
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【推荐2】已知球
的表面积为
,直四棱柱
的顶点均在球
的球面上,则该直四棱柱的体积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d2ddb991c90140061863a81ea689a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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