1 . 在三棱柱
中,
,侧面
是边长为2的正方形,点
,
分别在线段
、
上,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2019/4/15/2183007703670784/2183831677411328/STEM/a651b72373644af0835add62538dfcf5.png?resizew=161)
(Ⅰ)证明:平面
平面
;
(Ⅱ)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545d1d96452b302e31d0ff3b31baf23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c768b5126d1b66a3112684b665fd97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f5af7cdf388a47357c119f42140f9e.png)
![](https://img.xkw.com/dksih/QBM/2019/4/15/2183007703670784/2183831677411328/STEM/a651b72373644af0835add62538dfcf5.png?resizew=161)
(Ⅰ)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45224f7eac9d0cef64bf28d93e7721a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
您最近一年使用:0次
2016-12-04更新
|
906次组卷
|
3卷引用:江西省临川第十中学2021-2022学年高二上学期第一次月考数学(理)试题
2 . 如图,在四棱锥
中,
为等边三角形,平面
平面
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/8f66378a-d9c1-4c68-ba07-30e33819c0b8.png?resizew=221)
(1)求证:
;
(2)求二面角
的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e409a3a0db612b3fbe8f26bc40e83e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03952d664fba91020fc5f3bcf2f9746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f85543243052612fb75694d6978bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9af0f7538dc8fc5683ef4959a11c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701f3b0e2bedfe5195443459072d798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/8f66378a-d9c1-4c68-ba07-30e33819c0b8.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd4d3ed0d4f1a2296de6a91445376f2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3541d43bfeba7f5a5cf0112b93932020.png)
您最近一年使用:0次
2016-12-04更新
|
254次组卷
|
2卷引用:2015-2016学年江西省南城一中高二上学期期中考试理科数学试卷
11-12高二上·江西抚州·期末
3 . 如图,已知在直四棱柱
中,
,
,
.
![](https://img.xkw.com/dksih/QBM/2011/3/28/1570067445104640/1570067450396672/STEM/e8146c1c-7cb7-4c54-8ba9-70b5c698b71f.png?resizew=259)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0e5697eca3f5205cb7b343648240bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280011846e091743c4fc6b6ed1c698f4.png)
![](https://img.xkw.com/dksih/QBM/2011/3/28/1570067445104640/1570067450396672/STEM/e8146c1c-7cb7-4c54-8ba9-70b5c698b71f.png?resizew=259)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e0254c84e44728749b34c08c28ab1e.png)
您最近一年使用:0次