如图,已知
是边长为4的正三角形,D,E分别为AC,AB的中点,把
沿DE折起,使点A到达点P的位置,且平面PDE
平面BCDE.
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544627511353344/2544878578188288/STEM/231e7455-c1c3-4699-a0ca-14dc65ce960c.png?resizew=401)
(1)求PB与平面BCDE所成角的正弦值;
(2)求点E到平面PBC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2020/9/7/2544627511353344/2544878578188288/STEM/231e7455-c1c3-4699-a0ca-14dc65ce960c.png?resizew=401)
(1)求PB与平面BCDE所成角的正弦值;
(2)求点E到平面PBC的距离.
更新时间:2020-09-07 22:31:37
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥
中,满足
底面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/58c6e73d-ed91-4b11-8bd7-adcfb18eebe4.png?resizew=186)
(1)求证:平面
平面
;
(2)若平面
与平面
的夹角的余弦值为
,求B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d101cd311efd7e9cf066eb7a4136313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4e70eed32dfc460db47464db966a99.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/58c6e73d-ed91-4b11-8bd7-adcfb18eebe4.png?resizew=186)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd470cd9dfcde7f7e1762af28bc649c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
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解答题-证明题
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【推荐2】如图在直角梯形ABCD中,
,
,
,平面ABCD外有一点E,平面
平面ABCD,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/9c204bc9-64a9-4759-954a-56633902e8d0.png?resizew=198)
(1)求证:
;
(2)求点C到平面ABE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1b292baa30ffc34df3a47d57b60c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2f39d3fcb1664705228e683c2cc3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fd2c0ce2cf4af2ebab61da7ebf0dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302b34e451d5e5bf151609911f581217.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/9c204bc9-64a9-4759-954a-56633902e8d0.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5254da2da83b39b1496e61c3870b016c.png)
(2)求点C到平面ABE的距离.
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名校
【推荐1】如图,在四棱锥
中,
,
,
平面ABCD,
,M为PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/a60e0c8d-4932-49d7-be2b-aeee35e06efc.png?resizew=185)
(1)求证:
平面PAD;
(2)设点N在平面PAD内,且
平面PBD,求直线BN与平面ABCD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d316c9739b68261e38e1fc97f24cf8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/a60e0c8d-4932-49d7-be2b-aeee35e06efc.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
(2)设点N在平面PAD内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
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【推荐2】已知正四棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/b1a607e9-8143-4122-96fa-748b60b92127.png?resizew=123)
(1)求证:
;
(2)求直线
与
所成角的余弦值;
(3)求直线
与平面
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/b1a607e9-8143-4122-96fa-748b60b92127.png?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d638516fee0dc3251d384400f478715.png)
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解答题-证明题
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【推荐1】在菱形
中,
且
,点
分别是棱
的中点,将四边形
沿着
转动,使得
与
重合,形成如图所示多面体,分别取
的中点
.
(Ⅰ)求证:
平面
;
(Ⅱ)若平面
平面
,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5898ecbb5c528fa6cd5844d2133eb270.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31cfd3948a2fb76d99c35bc2d233b784.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7941d355eebcd363be2577d2107496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72221ee5b504d596ff799c0b356aa0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(Ⅱ)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db498ae869272d2d6c4bec8d2bcd61b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e89556992cbfd7043330ac7421d342.png)
![](https://img.xkw.com/dksih/QBM/2018/7/24/1995250609299456/2020870442860544/STEM/50f8a8f6d5e841ffbadc9947fedd2653.png?resizew=434)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】已知四边形
为矩形,
,
,将
沿对角线
折起为
,设
在底面内的射影为
.
![](https://img.xkw.com/dksih/QBM/2020/8/15/2528240295264256/2531127757832192/STEM/be21c6e798de40e3842186e16922ebb3.png?resizew=190)
(Ⅰ)若
在线段
上,求
长度;
(Ⅱ)若面
⊥面
.求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(Ⅰ)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(Ⅱ)若面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd148d264bc9043396f777523e907aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14ebd9b6932c26719ff556b3e79c8ac.png)
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