题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064128-74355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064129-52048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064129-25401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064129-50058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064129-15547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064128-74355.png)
(侧)视图的面积为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064130-28462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064130-77576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064130-82379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064130-13028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064130-53001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-50794.png)
的最小值为 .
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-35641.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-73355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-13450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-31622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-16770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-13450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-15617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-13450.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-98007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-13450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-10936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064133-61194.png)
而该几何体的左(侧)视图面积为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064133-48685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064133-63141.png)
将面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064133-66667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064134-92476.jpg)
其中,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064134-61779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064134-65898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064132-10936.png)
由上可得,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064134-52249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064134-99600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064135-33312.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064135-11810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064135-48648.png)
在等腰三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064131-13450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064135-97667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064136-53858.png)
核心考点
试题【如图3所示的几何体中,四边形是矩形,平面平面,已知,,且当规定主(正)视方向垂直平面时,该几何体的左(侧)视图的面积为.若、分别是线段、上的动点,则的最小值为 】;主要考察你对线线角等知识点的理解。[详细]
举一反三
如图6,平行四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064100-33553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064100-50836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064100-96470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064100-23510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-80177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-17852.png)
起,使二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-64764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-29781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-34233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064102-91835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064102-13581.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-29781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064102-53071.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064102-66759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064101-29781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064103-18260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064053-87639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064053-63565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064053-72186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064054-73632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064054-32304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064053-63565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064054-54131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064054-57538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064055-50599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064055-19034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064055-76937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064055-84252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064054-32304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064056-33962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064056-47551.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064056-15876.png)
A.![]() | B.![]() | C.![]() | D.24 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064057-14924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064048-25074.png)
A.平面![]() ![]() |
B.平面![]() ![]() |
C.平面![]() ![]() |
D.平面![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064034-61582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064034-24205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064034-61281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064034-88763.png)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064024-73054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064024-38494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064025-69137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064025-65128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064025-65595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064025-36209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064025-30325.png)
A.0条 | B.1条 |
C.2条 | D.3条 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022064026-14388.jpg)
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