如图所示,四棱锥
的底面
是边长为1的菱形
,
是
的中点,
底面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/aeb06c3a-e8f4-46bb-b4bb-8ff5d840f597.png?resizew=192)
(1)证明:平面
平面
;
(2)求平面
和平面
所成二面角(锐角)的大小.
![](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/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/aeb06c3a-e8f4-46bb-b4bb-8ff5d840f597.png?resizew=192)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26a7784c7419d8359fb119c8ecc03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
更新时间:2022-11-12 22:03:39
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在底面是菱形的四棱锥
中,
,
,
,点
在线段
上,且满足
.
(1)求平面
与平面
夹角的余弦值;
(2)在线段
是否存在一点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
平面
,若存在,请指出点
的位置,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4f142d753f5878ad14a8623d46cb46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ce2e773ee3f553baf5d56582c6ade1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd78dfe6e52155dbee08d33ae63be40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/9e87db8e-3a55-4f28-a857-cae97c771167.png?resizew=190)
(1)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8010e1a73f05117a278860c1c0c7f147.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图,已知四棱锥S﹣ABCD的底面ABCD是矩形,M、N分别是CD、SC的中点,SA⊥底面ABCD,SA=AD=1,AB
.
(I)求证:MN⊥平面ABN;
(II)求二面角A﹣BN﹣C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074609663cc1cfa6cf35a2ae9bfc1164.png)
(I)求证:MN⊥平面ABN;
(II)求二面角A﹣BN﹣C的余弦值.
![](https://img.xkw.com/dksih/QBM/2011/9/6/1570304166699008/1570304172179456/STEM/7cf9739c9a6d448d89ca9423065c5ec9.png?resizew=166)
您最近一年使用:0次
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适中
(0.65)
名校
【推荐3】在四棱锥
中,
平面
,
,
,
,
,
是
的中点,
在线段
上,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/ce009e71-5eb4-47e2-b5ed-f26c8dfabc63.png?resizew=194)
(1)求证:
平面
;
(2)在线段
上是否存在点
,使得
与平面
所成角的正弦值是
,若存在,求出
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ccb97edd123fa10ddc2926e54c9f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82547bb7d2d84cfc7cc9aee6bf2a464f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb25434985431dcc5c33fcbb3354b786.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/ce009e71-5eb4-47e2-b5ed-f26c8dfabc63.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca33f9f6c60764bc840eef65e173d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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【推荐1】三棱锥
各棱长为2,E为AC边上中点.
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898566258982912/2915633491329024/STEM/01fa4459-1b18-4568-a4be-fd22eda5ec6f.png?resizew=176)
(1)证明:
面BDE;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898566258982912/2915633491329024/STEM/01fa4459-1b18-4568-a4be-fd22eda5ec6f.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d682fd0344452998187cb6d48de3dd1.png)
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【推荐2】如图,在多面体ABCDEF中,平面
平面ABCD,四边形ABCD是边长为2的正方形,
是等腰直角三角形且
,
平面ADE且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/756d5d60-1f75-4044-a888-ef700d2dfd94.png?resizew=147)
求异面直线AE和DF所成角的大小;
求二面角
的平面角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2980b0d9e5daae1f60b4a67e9b87fff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d375bb9ccde2b6f1e6183d04520b5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce97548f7f4fc80db4ea3fc9a975aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6abc07010ba722dd6cfb60f1de857a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/756d5d60-1f75-4044-a888-ef700d2dfd94.png?resizew=147)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7005b21412fbc528191c17d894e3346a.png)
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