满分5 >
初中数学试题 >
在△ABC中,∠C=90°,tanA=,则sinB=( ) A. B. C. D...
在△ABC中,∠C=90°,tanA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496003_ST/0.png)
,则sinB=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496003_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496003_ST/4.png)
考点分析:
相关试题推荐
科技馆为某机器人编制一段程序,如果机器人在平地上按照图中所示的步骤行走,那么该机器人所走的总路程为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496002_ST/images0.png)
A.6米
B.8米
C.12米
D.不能确定
查看答案
如图,已知△ABC中,∠ABC=45°,AC=4,H是高AD和BE的交点,则线段BH的长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496001_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496001_ST/0.png)
B.4
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496001_ST/1.png)
D.5
查看答案
如图,△ABC中BC边上的高为h
1,△DEF中DE边上的高为h
2,下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523749665/SYS201311030005275237496000_ST/images0.png)
A.h
1>h
2B.h
1<h
2C.h
1=h
2D.无法确定
查看答案
如图,AD为Rt△ABC斜边BC上的高,点E为DA延长线上一点,连接BE,过点C作CF⊥BE于点F,交AB、AD于M、N两点.
(1)若线段AM、AN的长是关于x的一元二次方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523609676/SYS201311030005275236096023_ST/0.png)
的两个实数根,求证:AM=AN;
(2)若AN=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523609676/SYS201311030005275236096023_ST/1.png)
,DN=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523609676/SYS201311030005275236096023_ST/2.png)
,求DE的长.
查看答案
如图,四边形ABCD和四边形ACED都是平行四边形,点R为DE的中点,BR分别交AC、CD于点P、Q.
(1)请写出图中各对相似三角形(相似比为1除外);
(2)求BP:PQ:QR.
查看答案