如图,在四棱锥
中,底面ABCD是矩形,侧棱
底面ABCD,E、F、G分别为VA、VB、BC的中点.
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723964203532288/2784037363843072/STEM/03be655f041e4208971a46020a1ac480.png?resizew=168)
(1)求证:平面
平面VCD;
(2)当二面角
、
分别为
、
时,求直线VB与平面EFG所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c439e4e4e48b17e19e666d892216fe.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723964203532288/2784037363843072/STEM/03be655f041e4208971a46020a1ac480.png?resizew=168)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fd975b889bfe7ddcec0de56b6f23ee.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4934904f8d01862f3c444f0c39a3827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a09d63c718c92d3951a6fb1a824e068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
更新时间:2021-08-11 20:01:25
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图在三棱柱
中,
为
边的中点.
.
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438543295578112/2438989647093760/STEM/0c097159-f789-4182-b25d-2687e4574fd6.png?resizew=220)
(1)证明:
平面
;
(2)若
,
为
中点且
,
,
,求三棱锥
的体积.
![](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/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8401a8c82d590589045067c2af39aee.png)
![](https://img.xkw.com/dksih/QBM/2020/4/10/2438543295578112/2438989647093760/STEM/0c097159-f789-4182-b25d-2687e4574fd6.png?resizew=220)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed37556e3524d342bf19c961fde0a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9541b233e419ab5877c5a8406288762b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb50461e24aa7cb1943d06b594afa0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dea2b0826011360e9df261ae830c150.png)
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|
适中
(0.65)
解题方法
【推荐2】如图,五面体ABCDEF中,正方形ABCD的边长为
,AB=2EF,EF∥平面ABCD,点P在线段DE上,且DP=2PE,Q为BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2e48cf56-7e7c-4db2-a2a0-7f9d11e62cec.png?resizew=236)
(1)求证:BE∥平面APQ;
(2)已知AE⊥平面ABCD,且AE=2,求二面角P﹣AF﹣E的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/2e48cf56-7e7c-4db2-a2a0-7f9d11e62cec.png?resizew=236)
(1)求证:BE∥平面APQ;
(2)已知AE⊥平面ABCD,且AE=2,求二面角P﹣AF﹣E的余弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知三棱锥
中,
平面
,过点
分别作平行于平面
的直线交
于点
.
平面
;
(2)若
为
的中点,
,求直线
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a546cc14306823545141fd57225208ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76d097f3d2a6cf2c76b1e3f41dfe7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2b564ce642ef2ee56764819347d8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
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适中
(0.65)
名校
解题方法
【推荐2】如图,在正方体
中,棱长为2,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/96c76317-bf3e-48a9-bdd5-07182ef60fd8.png?resizew=202)
(1)求
到平面
的距离.
(2)若
面
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/96c76317-bf3e-48a9-bdd5-07182ef60fd8.png?resizew=202)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3613af55adaa0894a54270d5708e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7929d7d157bdaf73c810faa27d557f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b862daec732ca95059880e44e18e470.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
为正方形,平面
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/dd8ac246-5924-49b7-97e8-e2f236224fd0.png?resizew=204)
求平面
与平面
的夹角的大小;
若
是
的中点,求直线
与平面
所成角的正弦值.
![](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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b036f9e43b8c560aed40d1a3836094e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/dd8ac246-5924-49b7-97e8-e2f236224fd0.png?resizew=204)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
您最近一年使用:0次
解答题-证明题
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适中
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【推荐2】如图所示,四棱锥
的底面是边长为2的正方形,E、F、G分别为棱AB、BC、PD的中点.设三点A、E、G所确定的平面为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/b974fcb2-9727-435f-8081-dc6b0f6cd06f.png?resizew=196)
(1)求证:点M是棱PC的中点;
(2)若
底面ABCD,且二面角
的大小为45°.
①求直线EF与平面
所成角的大小;
②求线段PN的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/798a79db24fe29015f712741c2698883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1875175f08edfcdd8fe26d184bcb187a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/b974fcb2-9727-435f-8081-dc6b0f6cd06f.png?resizew=196)
(1)求证:点M是棱PC的中点;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1636b4530c0b42d0e0b649e90e3b9e85.png)
①求直线EF与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②求线段PN的长度.
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