如图,在二面角
的棱上有两个点,线段
与
分别在这个二面角的两个面内,并且都垂直于棱
,当
时,则四面体
外接球的半径为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85fd8271d25cebc4bac01a799ac6105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/688a1dbe-099b-4b69-adbf-752c53d14e8e.png?resizew=146)
更新时间:2023-08-20 14:59:00
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
【推荐1】一个正方体的顶点都在球面上,它的棱长为2cm,则球的表面积为_____________
.
![](https://img.xkw.com/dksih/QBM/2013/7/2/1571263081463808/1571263086845952/STEM/2acd9eb9170f46d79f8d5a5ca1899faa.png?resizew=29)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】如图,已知等腰三角形
的面积为
,
是底边
的中点,将
沿中线
折起,得到三棱锥
.若
,则该三棱锥外接球表面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3931333820859378ea6723ff3075189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】如图,已知二面角
,
,
,
,
,且
,
,则二面角
的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7650cede07c4758a9b3bb1da4553acc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
![](https://img.xkw.com/dksih/QBM/2021/7/30/2775278307287040/2791517443522560/STEM/4a51812cb1bf44cd9a801ebbdb34bb12.png?resizew=165)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】如图,在直棱柱
中,
,
,则二面角
的平面角的正弦值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb47de3697727587c26ae84356b6287.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/938ea6f6-0948-4e2a-9581-078ff73616d0.png?resizew=167)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐3】
是圆锥
的直径,
是它的一条母线,E、F是
的两个三等分点(E点靠近S点),C点在圆O上运动(不与A、B两点重合),则二面角
的平面角为
则
的最大值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03a4b4829cad4eab5c9bc09ffc1e8aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9654a29e95b955eb205915fb3aaba625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715478340091904/2715709847420928/STEM/13f611cbf5004eaeaa37352ca73b7b05.png?resizew=308)
您最近一年使用:0次