题目
题型:不详难度:来源:
已知 ∠
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150657-52664.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150657-25616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150657-84139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150657-53111.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150658-91275.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150658-87985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150658-62018.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150659-79764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150659-77865.gif)
连接
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150659-34033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150659-30490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150700-59549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150700-44497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150700-74645.gif)
圆的半径为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150701-87766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150701-24391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150701-24920.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150701-87766.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150701-72003.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150644-12793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150644-58318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150644-62902.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150645-70224.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150645-76555.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150645-10545.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150645-27008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150645-32739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150646-52774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150646-96187.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150646-52114.jpg)
(I)要使矩形
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150644-58318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150646-52183.gif)
(II)当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150646-52183.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150644-58318.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150624-65650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150624-89358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150624-65260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150625-62994.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150625-95677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150624-65260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150625-21809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150625-33850.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150624-65260.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150625-22627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150626-80151.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150626-66232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150626-45910.gif)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150626-67479.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150627-98435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150627-19969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150627-98745.gif)
(Ⅲ)求四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150627-68686.gif)
(Ⅰ)画出它的直观图(不要求写画法);
(Ⅱ)求这个几何体的表面积和体积.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150614-43302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021150603-52750.jpg)
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