满分5 >
初中数学试题 >
如图,⊙P内含于⊙O,⊙O的弦AB切⊙P于点C,且AB∥OP,若阴影部分的面积为...
如图,⊙P内含于⊙O,⊙O的弦AB切⊙P于点C,且AB∥OP,若阴影部分的面积为9π,则弦AB的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963021_ST/images0.png)
A.3
B.4
C.6
D.9
考点分析:
相关试题推荐
一个钢管放在V形架内,如图是其截面图,O为钢管的圆心.如果钢管的半径为25cm,∠MPN=60°,则OP=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/images0.png)
A.50cm
B.25
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/0.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/1.png)
cm
D.50
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963020_ST/2.png)
cm
查看答案
如图,AB是⊙O的直径,AC是⊙O的切线,A为切点,连接BC交圆O于点D,连接AD,若∠ABC=45°,则下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963019_ST/images0.png)
A.AD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963019_ST/0.png)
BC
B.AD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963019_ST/1.png)
AC
C.AC>AB
D.AD>DC
查看答案
图中,EB为半圆O的直径,点A在EB的延长线上,AD切半圆O于点D,BC⊥AD于点C,AB=2,半圆O的半径为2,则BC的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963018_ST/images0.png)
A.2
B.1
C.1.5
D.0.5
查看答案
已知圆O的半径为R,AB是圆O的直径,D是AB延长线上一点,DC是圆O的切线,C是切点,连接AC,若∠CAB=30°,则BD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963017_ST/images0.png)
A.2R
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963017_ST/0.png)
R
C.R
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963017_ST/1.png)
R
查看答案
如图所示,圆上有B,C两点,PB,PC为圆的两切线.若
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963016_ST/0.png)
将圆分成两弧,且其中一弧的长为圆周长的
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963016_ST/1.png)
,则∠BPC的度数为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963016_ST/images2.png)
A.108
B.120
C.144
D.162
查看答案