满分5 >
初中数学试题 >
如图,在△ABC中∠ACB=Rt∠,CD⊥AB于点D,已知AD=2,DB=1,则...
如图,在△ABC中∠ACB=Rt∠,CD⊥AB于点D,已知AD=2,DB=1,则( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663007_ST/images0.png)
A.CD=2
B.CD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663007_ST/0.png)
C.AC=6
D.AC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663007_ST/1.png)
考点分析:
相关试题推荐
关于相似三角形,下列命题中不正确的是( )
A.两个等腰直角三角形相似
B.含有30°角的两个直角三角形相似
C.相似三角形的面积比等于相似比
D.相似三角形的周长比等于相似比
查看答案
如图,在△ABC中,EF∥BC,AE:EB=1:2,则EF:BC为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663005_ST/images0.png)
A.1:2
B.1:3
C.1:4
D.2:3
查看答案
如图,在△ABC中,E是AB上的一点,EF∥BC交AC于点F,ED∥AC交BC于点D,且AE:EB=1:2,则△AEF的周长与△BED的周长之比为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663004_ST/images0.png)
A.1:2
B.1:3
C.1:4
D.不能确定
查看答案
用2倍放大镜照一个边长为3的等边三角形,则放大后三角形( )
A.边长为3
B.边长为12
C.内角为60°
D.内角为120°
查看答案
如图,若D、E分别为△ABC中AB、AC边上的点,且∠AED=∠B,AD=3,AC=6,DB=5,则AE的长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101349168566300/SYS201311031013491685663002_ST/2.png)
D.4
查看答案