如图,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cf6bbcd7-93f0-4c93-9690-813b6617f857.png?resizew=164)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a6b40391f8aa6663f20ea4f96f3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc438cb8f65c4808454520d11d885d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fd4ce957dc0d1e8740861e8910647f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/cf6bbcd7-93f0-4c93-9690-813b6617f857.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f2eae3483395cc6aca5160c64f83eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a06b68dc88cc22301870ad2819a1a2c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f76b6ac1b8875af7156f3239dae6f7.png)
更新时间:2023-12-15 16:57:54
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】(1)证明:如果一个平面与另一个平面的垂线平行,那么这两个平面互相垂直;
(2)若将(1)中的条件改为“如果一个平面与另一个平面的垂面平行”,结论是否仍然成立?
(2)若将(1)中的条件改为“如果一个平面与另一个平面的垂面平行”,结论是否仍然成立?
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,
的底面边长为2,高为
的正三棱柱,经过
的截面与上底面相交于
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/7dfa21be-cfff-411d-8b54-c752119e9e46.png?resizew=170)
(1)证明:
;
(2)当
时,在图中作出点
在平面
内的正投影
(说明作法及理由),并求四棱锥
表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcfd0bf7e6fd58dba0404f1300d356b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/7dfa21be-cfff-411d-8b54-c752119e9e46.png?resizew=170)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcc81f1bf10ddf0cd30c0ababaf2874.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858f284c387da8f005621953a381462b.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1】在三棱台
中,
,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791c86d61f1a63fb61f5e4ba11df92c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/ba0818e6-97e5-4196-b59c-2a421327c7fc.png?resizew=150)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ec713eb59a3332c44964d24ca859c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352d28609d1b3d09a0a29d023d1bb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791c86d61f1a63fb61f5e4ba11df92c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/ba0818e6-97e5-4196-b59c-2a421327c7fc.png?resizew=150)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5352d28609d1b3d09a0a29d023d1bb72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28d6477c85c5a4ac410a884e92fbe53.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
真题
解题方法
【推荐2】如图,正三棱柱
的底面边长为a,侧棱长为
.
,
的坐标;
(2)求
与侧面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827bec361fa9658bc190b57633f2b5aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
您最近一年使用:0次