在四棱锥P—ABCD中,平面PAB⊥平面ABCD,∠ABC=∠BCD=90°,PC=PD,PA=AB=BC=1,CD=2.
![](https://img.xkw.com/dksih/QBM/2021/12/22/2878188120391680/2917523442221056/STEM/fa3483a1-e42e-4020-99e1-f7c09afe43a2.png?resizew=185)
(1)证明:PA⊥平面ABCD;
(2)求点C到平面PBD的距离.
![](https://img.xkw.com/dksih/QBM/2021/12/22/2878188120391680/2917523442221056/STEM/fa3483a1-e42e-4020-99e1-f7c09afe43a2.png?resizew=185)
(1)证明:PA⊥平面ABCD;
(2)求点C到平面PBD的距离.
更新时间:2022-02-16 10:19:32
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【推荐1】在斜三棱柱
中,
是边长为2的正三角形,侧面
为菱形,且
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![](https://img.xkw.com/dksih/QBM/2020/7/9/2502381061545984/2503093476425728/STEM/2421aa72-4e80-4253-a09f-928cc3032549.png)
(1)求证:
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(2)求直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e5981445b6f2a6c58974158d96a4de.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
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【推荐2】如图所示,在四棱锥
中,底面ABCD是菱形,
,侧面PAD为等边三角形,其所在平面垂直于底面ABCD.
![](https://img.xkw.com/dksih/QBM/2020/11/7/2588046931173376/2590147680501760/STEM/ce031c76-e825-41e9-ac89-c0df6a43dbd9.png?resizew=236)
(1)求证:
;
(2)若E为BC边上的中点,能否在棱PC上找到一点F,使平面
平面ABCD?并证明你的结论.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/2020/11/7/2588046931173376/2590147680501760/STEM/ce031c76-e825-41e9-ac89-c0df6a43dbd9.png?resizew=236)
(1)求证:
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(2)若E为BC边上的中点,能否在棱PC上找到一点F,使平面
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【推荐3】如图,四棱锥
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,侧面
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(1)证明:
垂直于底面
.
(2)当点E在BC边上移动,使二面角
为
时,求二面角
的余弦值.
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【推荐1】在长方体
中,
,
是面对角线
上一点,且
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(1)求证:
;
(2)设异面直线
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【推荐2】如图,在三棱锥
中,平面
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到平面
的距离.
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(1)求
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(2)求点
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