如图,在正四棱柱
中,AB=1,E为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/49f70da1-a1e4-40b8-b891-7723b7980980.png?resizew=134)
(1)证明:平面
平面
;
(2)求
到平面BDE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/49f70da1-a1e4-40b8-b891-7723b7980980.png?resizew=134)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914d46f7e72b55d2ff3d9bc38e02b31d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
更新时间:2023-01-17 20:15:33
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相似题推荐
解答题-证明题
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【推荐1】如图,在四棱锥
中,
,
,
,
,
,
,
平面PAD,点M满足
.
,求证:平面
平面
;
(2)设平面MPC与平面PCD的夹角为
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71be6f57fdb788b6fe4a89efababd279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9fa8832f98b5418a7d75892f7951b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923718ac7b296dd2c3b5b1d8ea0c3b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c304d768ffa7a39a0d9d3debdc353a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f83464bf17f9d4d9ee6a7f299539871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d24305d21268a9b67cf6a8daae6bbe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c52b9478a450d15ff31eb1212a39ee6.png)
(2)设平面MPC与平面PCD的夹角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572c06bd0f70aaf88cfd95a37541ea28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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【推荐2】如图,三棱柱ABC-A1B1C1中,侧棱A1A⊥底面ABC,AC=BC,D、E、F分别为棱AB,BC,A1C1的中点.
![](https://img.xkw.com/dksih/QBM/2015/10/23/1572262858981376/1572262864789504/STEM/ce81886704174d9db54eecb4aec9cf98.png?resizew=137)
(1)证明:
平面A1CD;
(2)证明:平面A1CD⊥平面ABB1A1.
![](https://img.xkw.com/dksih/QBM/2015/10/23/1572262858981376/1572262864789504/STEM/ce81886704174d9db54eecb4aec9cf98.png?resizew=137)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
(2)证明:平面A1CD⊥平面ABB1A1.
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【推荐1】如图,四棱锥P-ABCD的底面ABCD是边长为2的菱形,
,PD⊥底面ABCD,
,E是PC的中点,F是PB上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/0de30dd4-70a7-4808-8620-3c786b428c23.png?resizew=207)
(1)证明:PD//平面AEF;
(2)求二面角
的正弦值;
(3)求三棱锥A-BEF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cd5c4f8b106d01e0e431078e1a468b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f95bd1d1d76dc662129716ef859ed7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/0de30dd4-70a7-4808-8620-3c786b428c23.png?resizew=207)
(1)证明:PD//平面AEF;
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a351d71fa01d3f5920e374a8ee7b524.png)
(3)求三棱锥A-BEF的体积.
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【推荐2】某校积极开展社团活动,在一次社团活动过程中,一个数学兴趣小组发现《九章算术》中提到了“刍甍”这个五面体,于是他们仿照该模型设计了一道数学探究题,如图1,E、F、G分别是正方形的三边AB、CD、AD的中点,先沿着虚线段FG将等腰直角三角形FDG裁掉,再将剩下的五边形ABCFG沿着线段EF折起,连接AB、CG就得到了一个“刍甍”(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/2bf645de-d816-4d96-bb4a-b7c1f091d30d.png?resizew=518)
(1)若
是四边形
对角线的交点,求证:
平面
;
(2)若正方形的变成为2,且二面角
是直二面角,求点
到平面
的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/2bf645de-d816-4d96-bb4a-b7c1f091d30d.png?resizew=518)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e826b8202fa0e17245dcc68426c923a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d786346b0e3f2d6666a2e7bf0b7e1251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7090ad13cf3664c89cdb2288779a9669.png)
(2)若正方形的变成为2,且二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770d42343599d3f26f0e0de8d5849f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7090ad13cf3664c89cdb2288779a9669.png)
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