如图,在四棱锥
中,底面
为正方形,点
在底面
内的投影恰为
中点,且
.若
,求证:
面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8361ee004d1e0716806b41a637a09c8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eb1c56398a34848942453685f53bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7442b64b37f685bc3ae88ff450c1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/197ac3ea-98d2-4e48-8bf3-9321eb5492de.png?resizew=183)
2023高一·全国·专题练习 查看更多[1]
(已下线)第28讲 空间直线、平面的垂直2种题型(2)
更新时间:2023-05-06 12:31:29
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【知识点】 证明线面垂直
相似题推荐
解答题-证明题
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【推荐1】如图,四棱锥
满足
面
,
.
,
.
![](https://img.xkw.com/dksih/QBM/2018/6/25/1974931368706048/1980563147259904/STEM/b758a812593f48cb83241d40a2657aad.png?resizew=243)
(Ⅰ)求证:面
面
.
(Ⅱ)求证:
面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7b5ea5627440c19999a9039eaa1c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0acbef22baa75438b90caa28ab6d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e7191b68d9f70d08bc40dd774b390d.png)
![](https://img.xkw.com/dksih/QBM/2018/6/25/1974931368706048/1980563147259904/STEM/b758a812593f48cb83241d40a2657aad.png?resizew=243)
(Ⅰ)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448cbac9a1ef3de7538a6b30cdc39582.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
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解题方法
【推荐2】如图,几何体
为直四棱柱
截去一个角所得,四边形
是菱形,
,
,
,P为
的中点.证明:平面
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52eab6de89f4d4e69650e94e0968744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bbaccd578a43b2397c8bdd50592fa07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50943279ee6f0299b3725eecd77bafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611db7041a52b0c0967a2e6f7577285c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/fdd0dcc7-88f8-4986-abc3-61509c1728c1.png?resizew=156)
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【推荐3】如图,在四棱锥P—ABCD中,PA⊥底面ABCD,AB⊥AD,AC⊥CD,∠ABC=60°,PA=AB=BC,E是PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/cb08f7ac-b9db-4ecc-b8fc-f3d080c9efcc.png?resizew=138)
(1) 证明:AE⊥平面PCD;
(2) 求PB和平面PAD所成的角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/cb08f7ac-b9db-4ecc-b8fc-f3d080c9efcc.png?resizew=138)
(1) 证明:AE⊥平面PCD;
(2) 求PB和平面PAD所成的角的大小.
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