如图,
的外接圆O的直径
垂直于圆O所在的平面,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/a950e36e-f702-4aba-b096-1dc7d9f5f86a.png?resizew=196)
(Ⅰ)求证:平面
平面
.
(Ⅱ)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040ad96bf89a27ba00558c56b73caf9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c1974057c990604161983e298a0541.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/a950e36e-f702-4aba-b096-1dc7d9f5f86a.png?resizew=196)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153e142167b0ac80ff464274e1753f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40043464067061b41399b4ec0bb29c8.png)
更新时间:2021-05-12 13:38:13
|
相似题推荐
解答题-问答题
|
适中
(0.65)
真题
【推荐1】如图,在四面体ABCD中,平面ABC⊥平面ACD,AB⊥BC,AC=AD=2,BC=CD=1
![](https://img.xkw.com/dksih/QBM/2014/6/5/1571759047401472/1571759053029376/STEM/d2ab27a9-1518-493d-95f0-184a21fe06d6.png?resizew=264)
(Ⅰ)求四面体ABCD的体积;
(Ⅱ)求二面角C﹣AB﹣D的平面角的正切值.
![](https://img.xkw.com/dksih/QBM/2014/6/5/1571759047401472/1571759053029376/STEM/d2ab27a9-1518-493d-95f0-184a21fe06d6.png?resizew=264)
(Ⅰ)求四面体ABCD的体积;
(Ⅱ)求二面角C﹣AB﹣D的平面角的正切值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在三棱锥S—ABC中,SA=SB,AC=BC,O为AB的中点,SO⊥平面ABC,AB=4,OC=2,N是SA的中点,CN与SO所成的角为α,且tanα=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f1856d01-b88b-442b-a2a0-0fd3a0c0c32d.png?resizew=152)
(1)证明:OC⊥ON;
(2)求三棱锥S—ABC的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/f1856d01-b88b-442b-a2a0-0fd3a0c0c32d.png?resizew=152)
(1)证明:OC⊥ON;
(2)求三棱锥S—ABC的体积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】把等腰直角三角形
以斜边
为轴旋转,使
点移动的距离等于
时停止,并记为点
.
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585235716481024/2585588662788096/STEM/c8efeda86dd242edaa49ac2a714dd6f8.png?resizew=178)
(1)求证:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/11/3/2585235716481024/2585588662788096/STEM/c8efeda86dd242edaa49ac2a714dd6f8.png?resizew=178)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf42acb8d1875acf1775e30ae2e3d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb7851bac6e137a2aabd6484076e4ae.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,在矩形ABCD中,
,
是
的中点,以
为折痕将
向上折起,使
到
点位置,且
.
(Ⅰ)若
是
的中点,求证:
面
;
(Ⅱ)求证:面
面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad29e2cbe9706555cc9fc36aee12f545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae119c3aebd074e7d172542378dbe78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c0ea293dc0b145d73857f6be59c328.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13af018556f0b484ed38519f2edc791c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48d69b63883e9383060666cad2a0c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593cce6ed83bc04d15464e5da398feb7.png)
(Ⅱ)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da198d82cfaa46c104c74dc8d03d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/164e1cc74e41a2a55d3767c006392bfd.png)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868158092296192/1869397840920576/STEM/a302c144300a475ea6309a0a86196887.png?resizew=149)
您最近一年使用:0次