已知三棱锥
中,底面ABC是边长为
的正三角形,点P在底面上的射影为底面的中心,且三棱锥
外接球的表面积为
,球心在三棱锥
内,则二面角
的平面角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375025f01ec49e6d50e45cce5fee8d88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
22-23高三·云南昆明·阶段练习 查看更多[2]
更新时间:2023-04-02 18:04:01
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相似题推荐
单选题
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适中
(0.65)
【推荐1】在正四棱台
中,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e909070e79df01cd95b14c4676e8de7.png)
A.该棱台的体积为![]() ![]() |
B.该棱台的体积为![]() ![]() |
C.该棱台的体积为![]() ![]() |
D.该棱台的体积为![]() ![]() |
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名校
【推荐2】某正三棱柱各棱长均为
,则该棱柱的外接球表面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐1】圆柱
内接于半径为定值
的球
,若圆柱
体积的最大值为
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f004a7920e1f47c4f957fc4e604fa6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
A.1 | B.2 | C.3 | D.4 |
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【推荐2】在三棱锥
中,已知
,平面
平面
,二面角
的大小为
,则三棱锥
的外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a382548dfc016f6674e8848acd2337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】正多面体统称为柏拉图体,被喻为最有规律的立体结构,其所有面都只由一种正多边形构成(各面都是全等的正多边形,且每个顶点所接的面数都一样,各相邻面所成的二面角都相等),正多面体共有5种,它们分别是正四面体、正六面体(即正方体)、正八面体、正十二面体、正二十面体.连接正方体中相邻面的中心(如图1),得到另一个柏拉图体,即正八面体
(如图2),设
分别为
的中点,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/a22c228e-6edf-44b1-b5cc-678ca834e7ee.png?resizew=455)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab0d6511bd3bbe3349ecccaac259edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e658d7985a600629fdf01517fc55c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738f1bc7ee104ad937540ac392e109af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/a22c228e-6edf-44b1-b5cc-678ca834e7ee.png?resizew=455)
A.![]() ![]() |
B.经过![]() |
C.平面![]() ![]() |
D.平面![]() ![]() ![]() |
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【推荐2】四面体
,
,
,
两两垂直,
,
,
分别是
,
,
上的点,且
,设二面角
,
,
的平面角分别为
,
,
,则( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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A.![]() | B.![]() |
C.![]() | D.![]() |
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