题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081610-14924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081610-26092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-82002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-50957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-26229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-59601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-99673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-22200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-55541.png)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-55541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-44426.png)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-16387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-44426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-16387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-82002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081610-14924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-45556.png)
答案
(Ⅱ)四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081610-14924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081612-38090.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081612-53668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081612-79312.png)
(2)先找出这两个线面角是解决本题的关键.过点B作
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081612-34019.png)
由(Ⅰ)CD⊥平面PAE知,BG⊥平面PAE.于是
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081613-33213.png)
所成的角, 由
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081613-27009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081613-28462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-16387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081611-82002.png)
从而可得
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081613-27895.png)
核心考点
试题【在四棱锥中,⊥平面,,,,,是的中点.(Ⅰ)证明:⊥平面;(Ⅱ)若直线与平面所成的角和与平面所成的角相等,求四棱锥的体积.】;主要考察你对空间几何体的视图与直观图等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081557-16690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081557-98650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081557-86250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-97025.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-77347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-13429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-60047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-76766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-54516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-41893.png)
(Ⅰ)证明:无论
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-51292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-87041.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-51292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081559-21242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081600-74376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081600-31878.png)
(Ⅲ)是否存在点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-76766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081600-17635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081600-74376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081558-76766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081600-18534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081552-79494.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081546-22464.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081542-76037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081542-53795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081543-20897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081543-57677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081534-44292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081534-86460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081534-17383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081534-18061.png)
(Ⅰ)将四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081534-44292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081535-76645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081535-40166.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081535-76645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081535-40166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081535-49316.jpg)
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