满分5 >
初中数学试题 >
如图,Rt△ABC中,∠ACB=90°,CD⊥AB,D为垂足,若AC=8,AB=...
如图,Rt△ABC中,∠ACB=90°,CD⊥AB,D为垂足,若AC=8,AB=10,则sin∠ACD的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365016_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365016_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365016_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365016_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365016_ST/3.png)
考点分析:
相关试题推荐
某印刷厂十月份印书40万册,十二月份印书60万册,求平均每月的增长率 (精确到1%).若设平均每月的增长率为 x,则依题意,可列出方程是( )
A.40(1+x)=60
B.40(1+x)
2=60
C.40(1+x)
3=60
D.40+40(1+x)+40(1+x)
2=60
查看答案
下列方程组中,二元二次方程组是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365014_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365014_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365014_ST/2.png)
D.
查看答案
已知等腰梯形的一条较短的底边长为6cm,较长的底边的一个底角的正弦值为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161740437736535/SYS201310221617404377365013_ST/0.png)
,梯形高为9cm,那么这个等腰梯形的较长的底边长
cm.
查看答案
如图,有一块直角三角形纸片,两直角边AC=3,BC=4,将直角三角形纸片ABC折叠,使直角边AC落在斜边AB上,折痕为AD,则BD=
.
查看答案
如图,将三角板的直角顶点放置在直线AB的点O处,使斜边CD∥AB,则∠α的余切的值是
.
查看答案