真题
解题方法
1 . 三棱锥被平行于底面
的平面所截得的几何体如图所示,截面为
平面
,
,D为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/0d297ea4-7186-47f4-aef5-697b824d1bd8.png?resizew=157)
(1)证明:平面
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a308f4677fc16ed7755d958caec95fa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3403cc9972fdd2076d1303df43faf983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/0d297ea4-7186-47f4-aef5-697b824d1bd8.png?resizew=157)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daae7d7d44e425de626f1081f682aa56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa84da7ead562cffd02afd5940f8aa3.png)
您最近一年使用:0次
真题
解题方法
2 . 如图,在底面为直角梯形的四棱锥
中,
平面ABCD,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/21f75acd-ab4d-4a42-832b-64481ca8d062.png?resizew=170)
(1)求证:
平面PAC;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b60d014f1283b6dad3d2b6d141b8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e6971eccdf0b5f255b600eb6359ed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/21f75acd-ab4d-4a42-832b-64481ca8d062.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
您最近一年使用:0次
3 . 如图,在底面为直角梯形的四棱锥
中,
平面ABCD,
,
.
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105881874300928/3106028367364096/STEM/a3ff451e012e48129af495ff64ec0043.png?resizew=176)
(1)求证:
平面PAC;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b60d014f1283b6dad3d2b6d141b8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e6971eccdf0b5f255b600eb6359ed5.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105881874300928/3106028367364096/STEM/a3ff451e012e48129af495ff64ec0043.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bf87f74420270138ed73a2d38ca48.png)
您最近一年使用:0次
2022-11-09更新
|
483次组卷
|
2卷引用:2007年普通高等学校招生考试数学(理)试题(陕西卷)
真题
解题方法
4 . 如图,
,点A在直线l上的射影为
,点B在l上的射影为
.已知
.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/dc55328e-8d58-493f-9703-858db69f453d.png?resizew=196)
(1)直线
分别与平面
所成角的大小;
(2)二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2684d8a1ef7f2695f6b6b69321f4aeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9aa2ceef42922d39183c282f2ecbf27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/dc55328e-8d58-493f-9703-858db69f453d.png?resizew=196)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
(2)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8d14cb6ffd35446eda6adbef072566.png)
您最近一年使用:0次
2022-11-09更新
|
249次组卷
|
2卷引用:2006年普通高等学校招生考试数学(文)试题(陕西卷)