满分5 >
高中数学试题 >
有一块多边形的菜地,它的水平放置的平面图形的斜二测直观图是直角梯形(如图),∠A...
有一块多边形的菜地,它的水平放置的平面图形的斜二测直观图是直角梯形(如图),∠ABC=45°,AB=AD=1,DC⊥BC,则这块菜地的面积为
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701014_ST/images0.png)
考点分析:
相关试题推荐
下列程序执行后输出的结果是
.
查看答案
设△ABC是等腰三角形,∠ABC=120°,则以A,B为焦点且过点C的双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701011_ST/2.png)
D.
查看答案
PA,PB,PC是从点P引出的三条射线,每两条的夹角均为60°,则直线PC与平面PAB所成角的余弦值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701010_ST/2.png)
D.
查看答案
抛物线y=-x
2上的点到直线4x+3y-8=0距离的最小值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231432347170101/SYS201311012314323471701009_ST/2.png)
D.3
查看答案