名校
解题方法
1 . 如图,线段
是圆柱
的母线,
是圆柱下底面
的内接正三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/8258e722-559c-4234-adbe-98aaf43fd125.png?resizew=140)
(1)劣弧
上是否存在点D,使得
平面
?若存在,求出劣弧
的长度;若不存在,请说明理由.
(2)求平面
和平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.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/effe791cf7422d81981f7f188e30dd76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/8258e722-559c-4234-adbe-98aaf43fd125.png?resizew=140)
(1)劣弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5483adc72a04c578f3b33b010720194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc9ffc43a56921fe79f8602636b8b0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76528e1056b52c4023421fba749aabed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982a72de174de5de98aa58b4c7d5a886.png)
您最近一年使用:0次
2022-11-11更新
|
1643次组卷
|
6卷引用:河南省豫东四校2022-2023学年高二下学期第一次联考数学试题
名校
2 . 如图,在四棱锥
中,底面
正方形,平面
底面
,平面
底面
,
,
分别是
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
平面
;
(2)求
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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/36dc88c2054948a03e74d57b10d3a482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e658d7985a600629fdf01517fc55c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67576cc7b83ee93cfd15154bb2a00c5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b8c2721ada247b03f41f328539b301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
2022-09-16更新
|
1100次组卷
|
4卷引用:河南省洛阳市第八高级中学2022-2023学年高一下学期5月月考数学试题
3 . 如图所示,在直角梯形BCEF中,
,A,D分别是BF,CE上的点,且
,
,将四边形ADEF沿AD折起,连接BE,BF,CE,AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/9590aac9-f994-41d8-9558-2667275643af.png?resizew=264)
(1)证明:
面BEF;
(2)若
,求直线BF与平面EBC所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb18f3937480ab5ad6cf0d65a357c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc5e7e3011ea41abd70e1a2c01b0b3e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/18/9590aac9-f994-41d8-9558-2667275643af.png?resizew=264)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429551ecb5930b2f033019e4d5b37ad7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a05d97047e3a5c8e125d334d478ee8e.png)
您最近一年使用:0次
2022-07-13更新
|
355次组卷
|
2卷引用:河南省许昌市2022-2023学年高一下学期期末数学试题
名校
解题方法
4 . 如图,已知四棱锥
中,
分别是
的中点,
底面
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5409942c6a29b7f347e22ed656e4d1b3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718965672411136/2720728923897856/STEM/e130e9f364104801bde24b28b84e692d.png?resizew=224)
(1)证明:
平面
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a3842f9e99b71d9fc4baa9c471a3da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd5e413cb380bfad5af472412236775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5409942c6a29b7f347e22ed656e4d1b3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/11/2718965672411136/2720728923897856/STEM/e130e9f364104801bde24b28b84e692d.png?resizew=224)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345368a256c743818a7ca1487ae4c4f4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae890f9e8b32aa53a54158f24f4a87bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b5e0b8c35a7d9b3d68db8e5c89b8bd.png)
您最近一年使用:0次
2021-05-14更新
|
1210次组卷
|
6卷引用:河南省周口市川汇区周口恒大中学2022-2023学年高一下学期5月月考数学试题
名校
5 . 如图所示,已知多面体
中,四边形
为菱形,
为正四面体,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/8aed5a62-e5b8-475e-9aed-725f94c3ee4c.png?resizew=192)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7045cee264e93b07cdf00012bd881a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/8aed5a62-e5b8-475e-9aed-725f94c3ee4c.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22eea13efafb003e7b08a6f0bc0f2f3.png)
您最近一年使用:0次
2020-05-03更新
|
307次组卷
|
4卷引用:河南省新乡市获嘉县第一中学2023-2024学年高二上学期第一次月考数学试题