点
是菱形
所在平面外一点,且
,求证:平面
平面
.
![](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/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/23/c02e45a3-8f39-472d-859f-5e3e45837bbc.png?resizew=165)
更新时间:2023-04-20 14:30:28
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【知识点】 证明面面垂直
相似题推荐
【推荐1】如图所示,在四棱柱
中,底面
是菱形,
.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844837721964544/2845017587367936/STEM/539f5d39-a074-4603-9db1-a3c087837d14.png?resizew=235)
(1)证明:平面
平面
;
(2)若四边形
是正方形,
,求四棱柱
的体积.
![](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/e735911ba4cd7f8fca6b3f65d705b573.png)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844837721964544/2845017587367936/STEM/539f5d39-a074-4603-9db1-a3c087837d14.png?resizew=235)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a05e0ab55e325fb3b85fc8ca9c27c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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解答题-证明题
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较易
(0.85)
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【推荐2】如图,在直三棱柱ABC-A1B1C1中,D,E分别为AB,BC的中点,点F在侧棱B1B上,且
,
.
求证:(1)直线DE
平面A1C1F;
(2)平面B1DE⊥平面A1C1F.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b595f8a0517b63585b065ea65fffbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab93035abd5877f2e52041358b817a08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/1/5c741679-e04f-4d70-b1c8-9624546b5db7.png?resizew=137)
求证:(1)直线DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
(2)平面B1DE⊥平面A1C1F.
您最近一年使用:0次