题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001143-75664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001143-13526.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001144-28756.png)
解析
核心考点
试题【在正三棱柱ABC-A1B1C1中,若BB1=1,AB=,求AB1与C1B所成角的大小。】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
(1)求证:PA∥平面EDB;
(2)求证:PB⊥平面EFD;
(3)求二面角C-PB-D的大小。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001137-72108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001105-96523.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001106-50852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001106-56519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001106-43970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001106-60498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001107-45028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001107-29631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001107-49758.png)
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A.![]() ![]() | B.四边形![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001101-59662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001101-83219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001053-65769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001053-92132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001053-92132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001053-77472.png)
(1)求GB与平面AGC所成角的正弦值.
(2)求二面角B—AC—G的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001053-89714.png)
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