如图所示,在正四棱锥P-ABCD中,点E、F,O分别是线段BC,PE,BD的中点.
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016653659914240/3018967435485184/STEM/70e6f9cac66f4fdaaee98664cb8bdc0b.png?resizew=191)
(1)求证:
平面PAD;
(2)若
,求二面角F-CD-E的正弦值.
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016653659914240/3018967435485184/STEM/70e6f9cac66f4fdaaee98664cb8bdc0b.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e447c70f2ad6d6a38afd6cad312007.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced3d3dd6af84fb052fc7281d707853e.png)
21-22高一下·海南·期末 查看更多[4]
海南省2021-2022学年高一下学期学业水平诊断数学试题江苏省镇江市句容碧桂园学校2022-2023学年高三上学期期初数学试题(已下线)微专题16 利用传统方法轻松搞定二面角问题(已下线)高一下学期期末数学考试模拟卷03-期中期末考点大串讲
更新时间:2022-07-09 18:07:52
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在几何体
中,四边形
是矩形,
平面
,
,
,
,
分别是线段
,
的中点.
平面
;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fb90434b6da93bdc6590f769ef118b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f3b062f380db4306af808f37cada22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c27a8fd3bf5b89a16dbbe1a8230653c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知四棱锥P—ABCD中,
平面ABCD,底面ABCD为菱形,
,AB=PA=2,E.F分别为BC.PD的中点.
![](https://img.xkw.com/dksih/QBM/2011/3/9/1570031871959040/1570031877349376/STEM/9666439585f344dbb39b2137450ffb9c.png?resizew=221)
(1)求证:PB//平面AFC;
(2)求平面PAE与平面PCD所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051f092cbf89536d7e8b9fbf9d49355d.png)
![](https://img.xkw.com/dksih/QBM/2011/3/9/1570031871959040/1570031877349376/STEM/9666439585f344dbb39b2137450ffb9c.png?resizew=221)
(1)求证:PB//平面AFC;
(2)求平面PAE与平面PCD所成锐二面角的余弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,
,
,
,点M在线段BC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/6afa3744-eda7-4f7d-ae3c-5e9ceb4d62d4.png?resizew=170)
(1)求证:
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d026b53da98365d1ad870639dd90ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0028211551dd418eaaf51dde450f8b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3e259571c2ee70ff1d54823e650481.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/6afa3744-eda7-4f7d-ae3c-5e9ceb4d62d4.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b503c5da1208576c9fabd3685153c9d2.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,梯形
中,
,四边形
中,
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/2a8d88ea-6640-491b-866b-c5226b9b8d3a.png?resizew=169)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:平面
平面
;
(Ⅲ)若
与
所成角为
,求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5425bdb5d57bb499fa3a3dcfe50a7e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63180d7f5a7ade9c8c8798e35ea8e569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/2a8d88ea-6640-491b-866b-c5226b9b8d3a.png?resizew=169)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486a67e7974099983dabc0f1b2b4675e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8dc6db50a9709c3f4d84eee7bdf1250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306681bd5aaa51e9c63ab3002e23dec5.png)
您最近一年使用:0次