如图,在棱长为2正方体
中,E,F分别是
,
的中点.
(1)求证:
平面
;
(2)求点A到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/b7f63dd7-e2a5-475a-8244-9cd7dab02687.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
(2)求点A到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
更新时间:2023-11-14 10:03:43
|
相似题推荐
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(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
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【推荐2】如图,在四棱锥
中,底面
是矩形,
为棱
的中点,平面
与棱
交于点
.
为棱
的中点;
(2)若平面
平面
,
,△
为等边三角形,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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【推荐1】如图,在四棱锥P﹣ABCD中,ABCD是平行四边形,M,N分别是AB,PC的中点,求证:MN
平面PAD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/d056dc0a-40d3-43da-9b0b-7bc6b48d44c1.png?resizew=179)
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【推荐2】如图所示,
所在的平面与长方形
所在的平面垂直.
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926877538336768/2929968329261056/STEM/4c12dd2bd8204c31bb1e51b940495dc1.png?resizew=199)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926877538336768/2929968329261056/STEM/4c12dd2bd8204c31bb1e51b940495dc1.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564376a88fa74090de9f7694226a6184.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90197a948331e61db644266368017e3.png)
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【推荐1】如图,在正方体
中,E、F、G分别是棱AB、
、
的中点,H为BE的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/98536258-8c37-4df5-91c6-0547fb940f5c.png?resizew=129)
(1)求证:平面
平面HFC;
(2)求直线
与CF所成角的余弦值;
(3)是否在线段BF上存在一点K,使其点K到平面HFC的距离恰好为棱长的一半?若存在,求出K点位置;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/98536258-8c37-4df5-91c6-0547fb940f5c.png?resizew=129)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da1bc66e898fc7ebd5fa7026ea4c139.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13cf3a313649d7b92f28dd9fb8c27e41.png)
(3)是否在线段BF上存在一点K,使其点K到平面HFC的距离恰好为棱长的一半?若存在,求出K点位置;若不存在,说明理由.
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名校
解题方法
【推荐2】如图,在四棱锥
中,
,
,
,
平面
,E为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b473418a-2d80-4fb1-bb41-57257e6b4a1f.png?resizew=159)
(Ⅰ)证明:
平面
;
(Ⅱ)若
,求点E到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810227b082bd14dbcde85c3181841571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/b473418a-2d80-4fb1-bb41-57257e6b4a1f.png?resizew=159)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672757753ee4387ac9ce54467663a82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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