如图,在四棱锥
中,
,
,
,平面
底面
,
,
分别是
和
的中点.
(1)求证:平面
平面
;
(2)求棱
的长,使得点
到直线
的距离为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c338517ca19b2064aae2f3f6ebee1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db27b7f29d7d01b2692f217bc3079fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/c46b8bc2-a1c5-40e1-a472-db9e48d58c3a.png?resizew=144)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71fe6cc1a7a6da647680eed36b3ff4.png)
更新时间:2023-07-21 16:19:00
|
相似题推荐
解答题-证明题
|
适中
(0.65)
真题
【推荐1】在如图所示的几何体中,
平面
,
平面
,
,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2010/8/14/1569816396398592/1569816401592320/STEM/6858f6ed-0683-4c3f-bd5f-a6ee08061ae5.png?resizew=180)
(I)求证:
;
(II)求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0134a8463eec67424af096f369777557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2010/8/14/1569816396398592/1569816401592320/STEM/6858f6ed-0683-4c3f-bd5f-a6ee08061ae5.png?resizew=180)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785546906851d56da452b46052eeb8a0.png)
(II)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,底面
是平行四边形,
,
,
,
,
,
分别为
,
的中点,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0849016506bbcf052981f9cf25ab06.png)
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797809120796672/2798733108690944/STEM/eef71ae0-718a-41db-9570-bf13e74cb0d3.png?resizew=268)
(1)证明:
;
(2)求直线
与平面
所成角的正弦值.
![](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/0aedf65d7d930fdb972d4802c0dea8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb28f1ebbdcd6c304d8a8d0ea28aae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9425630dcfe5a824c44904d4f71e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0849016506bbcf052981f9cf25ab06.png)
![](https://img.xkw.com/dksih/QBM/2021/8/31/2797809120796672/2798733108690944/STEM/eef71ae0-718a-41db-9570-bf13e74cb0d3.png?resizew=268)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f1c54b7a2afc6bcab38ddd209f60d5.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c52b9478a450d15ff31eb1212a39ee6.png)
您最近一年使用:0次
【推荐1】如图,在三棱锥S-ABC中,SA=SC,D为AC的中点,SD⊥AB.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941063032807424/2946232299233280/STEM/126f2d47-e38b-4fef-bc33-684cadb16b08.png?resizew=197)
(1)证明:平面SAC⊥平面ABC;
(2)若△BCD是边长为3的等边三角形,点P在棱SC上,PC=2SP,且
,求三棱锥A-PBC的体积.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941063032807424/2946232299233280/STEM/126f2d47-e38b-4fef-bc33-684cadb16b08.png?resizew=197)
(1)证明:平面SAC⊥平面ABC;
(2)若△BCD是边长为3的等边三角形,点P在棱SC上,PC=2SP,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634aa8063f58d87f44e3fc045cfe62c1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在几何体
中,四边形
是菱形,
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5f5478b9-6b9c-4e75-9c04-f5e90b185c0a.png?resizew=201)
(1)证明:平面
平面
;
(2)若
,
,且二面角
是直二面角,求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2612c3ed33135b60b5a08c173c9f84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/5f5478b9-6b9c-4e75-9c04-f5e90b185c0a.png?resizew=201)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ce82a4c37365f2d4dea2c4ad2e3288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2443a94bed3d2b1f95c04ebd61ac134a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179071147b940f5e2f80e74526cebf92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1496042c1d721cffd25053e997a9a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次