满分5 >
初中数学试题 >
已知,如图,梯形ABCD中,AD∥BC,∠B=45°,∠C=120°,AB=8,...
已知,如图,梯形ABCD中,AD∥BC,∠B=45°,∠C=120°,AB=8,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825022_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825022_ST/0.png)
B.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825022_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825022_ST/2.png)
D.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825022_ST/3.png)
考点分析:
相关试题推荐
在Rt△ABC中,∠C=90°,AB=13,BC=5,则tanA=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825021_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825021_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825021_ST/2.png)
D.
查看答案
如图,在菱形ABCD中,∠ABC=60°,AC=4,则BD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/2.png)
D.8
查看答案
如图,已知正方形ABCD的边长为2,如果将线段BD绕着点B旋转后,点D落在CB的延长线上的D′处,那么tan∠BAD′等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825019_ST/images0.png)
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825019_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825019_ST/1.png)
D.2
查看答案
如图,在△ABC中,∠A=30°,tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825018_ST/0.png)
,AC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825018_ST/1.png)
,则AB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825018_ST/images2.png)
A.4
B.5
C.6
D.7
查看答案
如图,△ABC中,∠C=90°,AC=16cm,AB的中垂线MN交AC于点D,连接BD,若cos∠BDC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825017_ST/0.png)
,则BC=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825017_ST/images1.png)
A.8cm
B.4cm
C.6cm
D.10cm
查看答案