题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041823-76487.gif)
(1)试用
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041823-76487.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041823-76487.gif)
![]() |
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041824-40225.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041824-68415.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041824-48176.gif)
则有
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041825-62038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041825-32108.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041825-99276.gif)
(2)由(1)知当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041825-33886.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041826-95581.gif)
所以当圆柱的高为3cm时,它的侧面积最大为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041824-68415.gif)
核心考点
试题【如图,一个圆锥的底面半径为2cm,高为 6cm,其中有一个高为 cm的内接圆柱. (1)试用表示圆柱的侧面积;(2)当为何值时,圆柱的侧面积最大】;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
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041814-80006.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041814-24976.gif)
(1)证明:AB⊥PC;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041815-48854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041815-10318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041815-57572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041814-80006.gif)
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-23397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-70190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-36052.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-70190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-80189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041807-60000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041807-84930.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041806-70190.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041807-55053.jpg)
(II)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041808-19303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041808-99962.gif)
(III)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041808-34955.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041808-97652.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041801-80502.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041751-87883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041752-70697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041752-60876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041752-27132.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041752-22939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041753-87341.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041753-47053.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041753-18416.gif)
(1)求圆锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041751-87883.gif)
(2)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041753-64400.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041753-98576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041754-14600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041747-91576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041747-84557.gif)
求证:(1)PA∥平面BDE
(2)平面PAC
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041747-91576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021041748-25399.gif)
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