如图,已知PA⊥矩形ABCD所在的平面,M、N分别为AB、PC的中点,∠PDA=45°,AB=2,AD=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a51752ea-91b3-4192-bb85-c9dfe1e257e5.png?resizew=181)
(1)求证:MN⊥CD;
(2)求点C点到平面PDM的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a51752ea-91b3-4192-bb85-c9dfe1e257e5.png?resizew=181)
(1)求证:MN⊥CD;
(2)求点C点到平面PDM的距离.
更新时间:2020-02-11 11:25:55
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【推荐1】如图,在直三棱柱
中,
,
,E,F为
上分别靠近C和
的四等分点,若多面体
的体积为40.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/8bca155d-9a99-42c0-8093-8cdbb44aa278.png?resizew=250)
(1)求
到平面
的距离;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac5e1093a147c521c5e8d0d5e266db54.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/8bca155d-9a99-42c0-8093-8cdbb44aa278.png?resizew=250)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dad9523239c10d02508439dbc0c0043.png)
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解答题-证明题
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解题方法
【推荐2】如图,将边长为
的正方形
沿对角线
折叠,使得平面
与平面
所成二面角为直角,
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2021/10/25/2836806852558848/2837660124364800/STEM/4ad769f983514dc4a51a56cebe631dc6.png?resizew=181)
(1)求证:直线
与平面
没有公共点;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfaad4c4467e27421876d8f2a4371d2.png)
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(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
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解答题-问答题
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解题方法
【推荐1】如图所示,在三棱锥P﹣ABC中,△PAB,△ABC均是等边三角形,PA⊥AC.
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(1)证明:AB⊥PC;
(2)若PC=2,求三棱锥P﹣ABC的体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/fcb682a5-33ec-4449-9f25-e163aaf8b83a.png?resizew=116)
(1)证明:AB⊥PC;
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【推荐2】如图,在三棱柱
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