满分5 >
初中数学试题 >
如图,在△ABC中,DE∥BC,若,DE=2,则BC的长为( ) A.2 B.4...
如图,在△ABC中,DE∥BC,若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356020_ST/0.png)
,DE=2,则BC的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356020_ST/images1.png)
A.2
B.4
C.6
D.8
考点分析:
相关试题推荐
如图,在Rt△ABC中,∠C=90°,CD⊥AB,垂足为D,AD=8,DB=2,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356019_ST/images0.png)
A.4
B.16
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356019_ST/0.png)
D.4
查看答案
如图,已知等腰△ABC中,顶角∠A=36°,BD为∠ABC的平分线,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356018_ST/0.png)
的值等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356018_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356018_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356018_ST/2.png)
C.1
D.
查看答案
已知任意四边形ABCD中,对角线AC、BD交于点O,且AB=CD,若只增加下列条件中的一个:①AO=BO;②AC=BD;③
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356017_ST/0.png)
;④∠OAD=∠OBC,一定能使∠BAC=∠CDB成立的可选条件是( )
A.②
B.①②
C.③④
D.②③④
查看答案
如图,梯形ABCD中,AB∥CD,对角线AC、BD相交于O,下面四个结论:
①△AOB∽△COD
②△AOD∽△BOC
③S
△DOC:S
△BOA=DC:AB
④S
△AOD=S
△BOC.其中结论始终正确的有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356016_ST/images0.png)
A.1个
B.2个
C.3个
D.4个
查看答案
如图,在等边△ABC中,P为BC上一点,D为AC上一点,且∠APD=60°,BP=1,CD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356015_ST/0.png)
,则△ABC的边长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101342318435671/SYS201311031013423184356015_ST/images1.png)
A.3
B.4
C.5
D.6
查看答案