如图,正三棱柱
的所有棱长都为2,
为
的中点.
(1)求
与
所成角的余弦值;
(2)求证:
平面
;
(3)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/182bb8f1-41ab-4f7b-9271-85e3c11e2b75.png?resizew=155)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4560fa4ad459b58b723c74bd24e51ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a40d8806b86572352ed08aa2b7f89f7.png)
更新时间:2023-10-14 21:22:47
|
相似题推荐
【推荐1】三棱锥
中,平面
平面
,
为等边三角形,
且
,O、M分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e7db42de-e9b2-4abf-a079-d5f750ff99b8.png?resizew=132)
(1)求证:平面
平面
;
(2)求点B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8704811c9c5dba854310ae0de2ba6b05.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e7db42de-e9b2-4abf-a079-d5f750ff99b8.png?resizew=132)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90cacdef2c5f2a4b00a1f4f3fe77bd9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f526e2fe627bb4ddebe708c07d0a22fc.png)
(2)求点B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
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解题方法
【推荐2】如图,在直三棱柱
中,M,N分别为棱
,
的中点,
,
,
,
.
(1)求证:
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d0fdc5a00ca0e857b89a7e1420df29.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cf61780928291d51c7bbb08a5fcf81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae80f09dae8acbe1e5e27bd5c4d8164.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/953398d039a43d5d4bd0eb7c52ffb7ff.png)
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适中
(0.65)
【推荐1】在棱长为2的正方体
中,M,N,O,P分别为BC,
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/13a7d83a-3e39-4de8-ae28-b936f49b5b46.png?resizew=171)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
平面
;
(2)求异面直线BN与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/13a7d83a-3e39-4de8-ae28-b936f49b5b46.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4cfef623a9534b5708df5f95f1760a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82db65854bf434ba6dc37e5f90cdab6f.png)
(2)求异面直线BN与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e346ac3950f60077291dda2be73c3.png)
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适中
(0.65)
解题方法
【推荐2】如图所示,在正四棱锥
中,底面边长为
,高为
,
为侧棱
的中点,求:
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492402308710400/2492996223557632/STEM/a12cf10c5c6b4b5cada25307dec417c1.png?resizew=212)
(1)
与
所成角的大小;
(2)二面角
的大小;
(3)
到面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a392d05d3cfcbb438569b1ea9980dc2.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492402308710400/2492996223557632/STEM/a12cf10c5c6b4b5cada25307dec417c1.png?resizew=212)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080357c95392e1c1831d999893ec6e77.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f526e2fe627bb4ddebe708c07d0a22fc.png)
您最近一年使用:0次
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适中
(0.65)
解题方法
【推荐1】如图,在以
为顶点的五面体中,四边形
为正方形,四边形
为等腰梯形,
,且平面
平面
.
平面
;
(2)求平面
和平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63a98f5ed97655875ffb3f9eb413d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c41158715d94c6c9ffebdee957d2618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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适中
(0.65)
名校
【推荐2】如图,在四棱柱
中,
平面
,
,
,
,
,若
与
交于点
,点
在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/314274cf-773a-4ded-91e2-ea06382e70bc.png?resizew=155)
(1)求证:
平面
;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8f0041d82920c5eceef705629893d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/314274cf-773a-4ded-91e2-ea06382e70bc.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
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适中
(0.65)
名校
【推荐3】如图,PD垂直于梯形ABCD所在的平面,∠ADC=∠BAD=90°,F为PA中点,
,
.四边形PDCE为矩形,线段PC交DE于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/b798f2cb-061d-4cf7-a383-5eed9abd22a2.png?resizew=184)
(1)求证:AC∥平面DEF;
(2)求二面角A-BC-P的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7a201432af0a2f9d21c6803906f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/b798f2cb-061d-4cf7-a383-5eed9abd22a2.png?resizew=184)
(1)求证:AC∥平面DEF;
(2)求二面角A-BC-P的余弦值.
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