1 . 已知四棱锥
中,底面
为平行四边形,
,平面
平面
.
(1)若
为
的中点,证明:
平面
;
(2)若
,求平面
与平面
所夹角的余弦值.
![](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/413c799e8fb983e6274ec4be9ff6c431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91aa035904a72103b1099abb44fe639d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/0dc2112e-cc3f-462e-8cce-a3f4308a81be.png?resizew=132)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb18df70ba0d71d703fb02770746347f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96ed3ecedad4f0bfeea72f52e5b2614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
名校
2 . 已知四面体ABCD,D在面ABC上的射影为
,
为
的外心,
,
.
(1)证明:BC⊥AD;
(2)若E为AD中点,OD=2,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79faaf0e895a5e3edf40756d990e1161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/5a52cbb1-69b4-4e70-b773-e3b963b6bae7.png?resizew=136)
(1)证明:BC⊥AD;
(2)若E为AD中点,OD=2,求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1ef8395c1f528613bcf683cfe9dc1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac901ff434c379e158fccd64dc6401f.png)
您最近一年使用:0次
2023-05-26更新
|
897次组卷
|
3卷引用:浙江省杭州第二中学等四校2023届高三下学期5月高考模拟数学试题
解题方法
3 . 建筑物的屋面在顶部交汇为一点,形成尖顶,这种建筑叫攒(cuán)尖建筑,其屋顶叫攒尖顶.其特点是屋顶为锥形,没有正脊,顶部集中于一点,即宝顶,该顶常用于亭、榭、阁和塔等建筑.1981年温州江心屿的东西双塔列为温州市第一批文物保护单位.江心屿东塔为六角攒尖顶,其檐平面呈正六边形,它有着与其角数相同的垂脊和围脊,如图所示,它的轮廓可近似看作一个正六棱锥.假设东塔的围脊为
,垂脊为
,则攒尖坡度(屋顶斜坡与檐平面所成二面角的正切值)为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/5ed8f00a-ddbb-4d91-892f-b6a460864bee.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/23/b374648c-835c-437d-8b82-8e073bea3310.png?resizew=151)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 如图,在三棱柱
中,
,点D为线段
中点,侧面
为矩形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/12288e6a-d968-4543-9a0e-bfbb1b35b469.png?resizew=194)
(1)若
,求二面角
的正弦值;
(2)若
,
,求AD与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c40bccd2075cf8504ddfe1d31d41b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ab5bbe088bfa1e258571d8d89ea5dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/12288e6a-d968-4543-9a0e-bfbb1b35b469.png?resizew=194)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404005c9bb408214fe5bafee7507e175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c6ee40dff32baf8ffbf3cd4562c25a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ccb0814f546091c7838e356b60b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
您最近一年使用:0次
名校
解题方法
5 . 在正四棱锥
中,Q是AB上的动点(不包含端点),M是AD上的中点,点N在线段AD上且满足
,分别记
,
,
的平面角为α,β,γ,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfbbd8c8a5727b631af2a43ab06a677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30700f4e58a0d10d735b5ff78c40ec4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b86dcf0024f3e8b1a9cafa390771d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 在三棱锥
中,已知
,
,且顶点
在底面的射影在
的内部,记面
,面
,面
与底面
所成的角分别为
,
,
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/023933ca-8789-48b1-9502-211a24280898.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba1af71094b0522a0df6c7fae1580e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e34c897e73d14a7bf1d72ad218546d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21665d21bbfb04410c78345de1fd15ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc6f6dfdbe7d39891c35f67e1a95c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/023933ca-8789-48b1-9502-211a24280898.png?resizew=157)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
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7 . 四边形ABCD为正方形,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/41c6bd1f-1c3d-4328-9286-cdbad37a1b70.png?resizew=166)
(1)证明:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9111c8e64fc183a777dbe0e82c9202cd.png)
(2)求二面角
的正切值.
![](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/db13e8affea90632f591077308119cef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541f54aae0dfb658ec0cd338e383cce0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/41c6bd1f-1c3d-4328-9286-cdbad37a1b70.png?resizew=166)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b61346bd4091070ba84a4046f87f365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9111c8e64fc183a777dbe0e82c9202cd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514c68b4b94214321459fc2c278ee4f9.png)
您最近一年使用:0次
2023-05-12更新
|
1522次组卷
|
3卷引用:浙江省长河高级中学2022-2023学年高一下学期期中数学试题
名校
8 . E、F是正方体
的棱DC上两点,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.直线![]() ![]() |
B.平面![]() ![]() ![]() |
C.平面![]() ![]() ![]() |
D.直线![]() ![]() ![]() |
您最近一年使用:0次
9 . 已知三棱锥
中,△
是边长为3的正三角形,
与平面
所成角的余弦值为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/9ddcd617-0a02-4ed3-bbb8-061a42205fe5.png?resizew=160)
(1)求证:
;
(2)求二面角
的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b3ff0a1b2125d3864027aaf8ae7577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/9ddcd617-0a02-4ed3-bbb8-061a42205fe5.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
您最近一年使用:0次
2023-05-09更新
|
1341次组卷
|
6卷引用:浙江省温州市普通高中2023届高三下学期3月第二次适应性考试数学试题
浙江省温州市普通高中2023届高三下学期3月第二次适应性考试数学试题(已下线)专题05 立体几何(已下线)专题14 押全国卷(理科)第18题 立体几何(已下线)专题10 空间角、距离的计算-期中期末考点大串讲(苏教版2019必修第二册)江苏省淮安市楚州中学、新马中学2022-2023学年高二下学期期中联考数学试题(已下线)专题03 立体几何大题
名校
解题方法
10 . 在四棱锥
中,
平面
,底面
为正方形,
,E和F分别为
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/97e305e8-d789-4b54-a36b-cb69e8b2f3c5.png?resizew=165)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/3/97e305e8-d789-4b54-a36b-cb69e8b2f3c5.png?resizew=165)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28b5b7b3ce8cfd88c3428883bd0852e.png)
您最近一年使用:0次
2023-04-27更新
|
1967次组卷
|
3卷引用:浙江省浙南名校联盟2022-2023学年高一下学期期中联考数学试题