在三棱锥
中,底面
是边长为3的等边三角形,
,
,若此三棱锥外接球的表面积为
,则二面角
的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699ed383b9f9d6bbed1834da7735eb44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2095837b7420f07fc9ae946ece406df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefbfd148d8cf70d2370c1465847aa60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7fe637f1537666932491637f9b3d3ee.png)
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22-23高一下·河北石家庄·期末 查看更多[2]
更新时间:2023-07-21 15:37:52
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】四棱锥
的底面
为正方形,
底面
,
,
,若该四棱锥的所有顶点都在同一球面上,则该球的表面积为( )![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a71eff7078572736e675d620af74ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f7614ce62cf0c115cad788bc04e116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a71eff7078572736e675d620af74ff0.png)
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您最近一年使用:0次
单选题
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适中
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解题方法
【推荐2】已知
均在球
的表面上,
为边长为
的等边三角形,
平面
,
,则球
的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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您最近一年使用:0次
单选题
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适中
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解题方法
【推荐1】正方体
,
是线段
(不含端点)上的点.记直线
与直线
所成角为
,直线
与平面
所成角为
,二面角
的平面角为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3136cc58073264fb184760488926498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
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您最近一年使用:0次
单选题
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解题方法
【推荐2】如图,四棱锥
中,底面
是边长为2的正方形,其他四个侧面都是侧棱长为
的等腰三角形,则二面角
的大小
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/b6cfaa0c-5810-41a4-a071-f2bf952bb013.png?resizew=200)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5768a8d6630375daf58e971fa200c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/b6cfaa0c-5810-41a4-a071-f2bf952bb013.png?resizew=200)
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