如图,在四棱锥
中,底面
是菱形,且
,
为正三角形,
.
(1)求证:
面
;
(2)若
是
的中点,求
与面
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/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19269cd8c880d41ecb5aa9f5aba43f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/05874cac-84ac-4701-9a29-5207b0da7d1f.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
2023高二下·浙江温州·学业考试 查看更多[2]
更新时间:2023-06-22 13:48:00
|
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,圆锥
的母线长为
,
是
的内接三角形,
.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983618612707328/2984792306597888/STEM/ca146d52-c878-402e-9552-26a6b158b3f2.png?resizew=204)
(1)若
是正三角形,求三棱锥
的体积;
(2)若平面
平面
,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983618612707328/2984792306597888/STEM/ca146d52-c878-402e-9552-26a6b158b3f2.png?resizew=204)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在Rt△POA中
,将△POA绕边PO旋转到△POB的位置,使
,得到圆锥的一部分,点C为
的中点,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/d457a597-40f3-43f6-8d4e-64cc6f1fda12.png?resizew=122)
(1)求证:
:
(2)求点C到平面PAB的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5c239eef2d9abdafe0b0662fe2f514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e21aa38de80da8ccaa7ce51595e7bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/d457a597-40f3-43f6-8d4e-64cc6f1fda12.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
(2)求点C到平面PAB的距离.
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解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,在以A,B,C,D,E,F为顶点的五面体中,面CDFE为正方形,
,
,点C在面ABEF上的射影恰为
的重心G.
(1)证明:
;
(2)证明:
面EFDC;
(3)求该五面体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aff1e4c4a788b2cc227b5442b6f2c9d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6045266f6db39e41b7abde762d9e9a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/adffd6d1-2c31-4d3d-9c4b-b46eb009ae5f.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
(3)求该五面体的体积.
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解答题-问答题
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适中
(0.65)
解题方法
【推荐2】如图所示,在四棱锥
中底面ABCD是边长为2的菱形,
,面
面
,
.
(1)证明:
;
(2)求点A到平面PBC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf80b036459da6dcb841a4bbe3859fc.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/8b01fa08bfa35362d4cfabcbe1c01458.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/6/f407c4c7-4f61-4a27-98ec-abf98e900ab6.png?resizew=157)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0063f3f48e49f2970ec7f097567cef5.png)
(2)求点A到平面PBC的距离.
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【推荐3】如图,在三棱柱ABC-A1B1C1中,AA1⊥底面ABC,∠ACB=90°,AC=1,AA1=BC=2,点D在侧棱AA1上.
(1)若D为AA1的中点,求证:C1D⊥平面BCD;
(2)若A1D=
,求二面角B—C1D—C的大小.
(1)若D为AA1的中点,求证:C1D⊥平面BCD;
(2)若A1D=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2017/5/3/1679016191188992/1738647893573632/STEM/e40d0886-68d3-4a56-ae00-50e1cf6ffcbf.png?resizew=258)
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,四边形
是边长为
的菱形,
,四边形
是矩形,
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/fb7423ab-e797-4e65-89d7-e4cac5714cc9.png?resizew=173)
(1)求直线
与平面
所成角的正弦值;
(2)求平面
与平面
的夹角的大小;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9778dc168ece0bbeb6c91fc42c6d7211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc45b089f5323ac19636fc84465e60b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/fb7423ab-e797-4e65-89d7-e4cac5714cc9.png?resizew=173)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9778dc168ece0bbeb6c91fc42c6d7211.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281db65d019f6f77dc0dfcc675ce93d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4984ee07d47dbcc4705137cd6d931d8.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在四棱锥
中,
底面
,
,
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/41a3a54f-1be8-4651-ad79-b25269cb3397.png?resizew=194)
(1)求证:
;
(2)在线段
上,是否存在一点
,使得二面角
的大小为
,如果存在,求
与平面
所成的角的正切值,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c41757ae282475fb29ec1e8e02045d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8c91e4c85a9da7f54b2237d870a50d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/41a3a54f-1be8-4651-ad79-b25269cb3397.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698335f4880c7a298f4898c83b6562bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,已知三棱锥
平面
,点
是点
在平面
内的射影,点
在棱
上,且满足
.
(1)求证:
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2334f72db7d296361167a00790b69031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed00acd878a18a2ac3c932f01ab6200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2bd1b595743d231779a6818ab02599.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/8253122e-7647-4d8c-8e9e-3b72156dc185.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3dbf0e4e79a4ed378f9395330a5837b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6760f565c694d1cdb6d7068e14526d00.png)
您最近一年使用:0次