若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678011_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678011_ST/1.png)
=
.
考点分析:
相关试题推荐
在比例尺为1:2000的地图上测得AB两地间的图上距离为5cm,则AB两地间的实际距离为
m.
查看答案
如图,在▱ABCD中,E是BC的中点,且∠AEC=∠DCE,则下列结论不正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678009_ST/images0.png)
A.S
△AFD=2S
△EFBB.BF=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678009_ST/0.png)
DF
C.四边形AECD是等腰梯形
D.∠AEB=∠ADC
查看答案
把一个矩形对折成两个相等的矩形后,与原来矩形相似,则原矩形长与宽之比为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678008_ST/0.png)
+1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678008_ST/1.png)
-1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678008_ST/2.png)
D.
查看答案
如图是小玲设计用手电来测量家附近“新华大厦”高度的示意图.点P处放一水平的平面镜,光线从点A出发经平面镜反射后刚好射到大厦CD的顶端C处,已知AB⊥BD,CD⊥BD,且测得AB=1.2米,BP=1.8米,PD=24米,那么该大厦的高度约为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678007_ST/images0.png)
A.8米
B.16米
C.24米
D.36米
查看答案
两个相似三角形的面积比为1:4,则它们对应的中线的比为( )
A.1:2
B.2:1
C.1:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678006_ST/0.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001104128667831/SYS201311030011041286678006_ST/1.png)
:1
查看答案