题目
题型:不详难度:来源:
(1)求证:EF⊥平面GMC.
(2)若AB=4,GC=2,求点B到平面EFG的距离.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210504-87997.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210504-81870.gif)
解析
∵E,F是正方形ABCD边AD,AB的中点,AC⊥BD,
∴EF⊥AC.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210504-24553.gif)
∵AC∩GC=C,
∴EF⊥平面GMC.
(2)可证BD∥平面EFG,由例题2,正方形中心O到平面EFG
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210504-37570.gif)
核心考点
试题【如图,已知E,F分别是正方形ABCD边AD,AB的中点,EF交AC于M,GC垂直于ABCD所在平面.(1)求证:EF⊥平面GMC.(2)若AB=4,GC=2,求】;主要考察你对两点间的距离等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210453-69376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210453-46047.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210453-69376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210453-49997.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210453-46047.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210454-61865.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210454-47602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210454-64309.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210454-27320.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210454-22213.gif)
(1) 求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210455-32554.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210455-56922.gif)
(2) 求线段
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210455-79032.gif)
![]() |
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210448-48827.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210442-48207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210432-10577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210432-84365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-26773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-23154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-46156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210432-10577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-26773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-22987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210432-10577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210433-26773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210423-72883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210423-69517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210424-80454.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210424-82115.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210424-12939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210423-72883.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210424-15618.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022210424-82115.gif)
最新试题
- 1Our country is quite different from _____ twenty years ago.
- 2有人说:“如果没有韦石之变或当时全军北伐,太平天国革命本可成功。”这种观点的错误主要是[ ]A.夸大偶然因素忽视
- 3在元素周期表短周期元素中,X元素与Y、Z、W三元素相邻,X、Y的原子序数之和等于Z的原子序数,这四种元素原子的最外层电子
- 4当A、B两地同时日出时,下列叙述正确的是( )A.A地日出时间大约在5时 B.乙国处于多雨季节
- 5开心果耐旱怕涝。在西亚伊朗,品质最好的开心果产自环境恶劣的高原沙漠地区。这种现象表明A.优质农产品一般生长在环境恶劣的高
- 6下列计算中正确的是 [ ]A.(﹣1)4×(﹣1)3=1B.﹣(﹣3)3=9C.|﹣a|D.
- 7你有过捉鱼的经历吗?下河摸鱼时,已经捉到手的鱼往往又会让它挣脱,这是由于其体表面有很滑的黏液,鱼表面黏液的主要作用是(
- 8The parents were happy to know that their son had won _____
- 9【题文】读图,判断正确的是( )A.b在d东方B.d比a纬度高 C.c在b东北方D.a
- 10如图所示已画出发光点发出的光经平面镜反射后的两条光线,请画出发光点的位置和相对应的两条入射光线。
热门考点
- 1现有CH4、C2H4、C2H6三种有机化合物: (1)等质量的以上物质完全燃烧时耗去O2的量最多的是________
- 2某种植物果实甜味对酸味为显性(A),子叶宽大对狭窄为显性(B),经研究证实A和B独立遗传,结合下面植物杂交实验的简图,分
- 3选出划线字解释有误的一项[ ]A、鉴赏(鉴定) 鞭长莫及(达到,够得上) B、信步(随意,听凭) 自出心裁(自心
- 4细胞分化:在发育过程中,有些细胞各自具有了不同的______,在形态、______上逐渐发生变化的过程.
- 5设关于x的一次函数y=k1x+b1与y=k2x+b2,则称函数y=m(k1x+b1)+n(k2x+b2)为此两个函数的生
- 6(14分)X、Y、Z、W四种化合物均由常见元素组成,其中X含有四种元素,Y、Z含有三种元素,X、Y、Z的焰色反应均为黄色
- 7如图所示△ABC≌△CDA,那么下列结论错误的是( )A.∠BAC=∠DCAB.AD=CBC.∠D=∠BD.DC=BC
- 8有一白色固体粉末可能是碳酸钠、亚硫酸钠、硫酸钠中的一种或二种,某兴趣小组拟对该样品进行探究.(1)取少量样品溶解于水,测
- 9(4分)下图是甲、乙两种固体物质的溶解度曲线,回答下列相关问题。(1)t1℃时,100g水中溶解20g甲,溶液刚好饱和;
- 10I have a friend. His name is Eric. He is English. But now he