满分5 >
初中数学试题 >
如图所示,圆上有B,C两点,PB,PC为圆的两切线.若将圆分成两弧,且其中一弧的...
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
考点分析:
相关试题推荐
如图所示为扇形DOF与直角△ABC的重迭情形,其中O,D,F分别在AB,OB,AC上,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/0.png)
与BC相切于E点.若OF=3,∠DOF=∠ACB=90°,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/1.png)
:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/2.png)
=2:1,则AB的长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/images3.png)
A.6
B.3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/3.png)
C.6
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963015_ST/4.png)
D.
查看答案
如图,⊙O的半径为2,点A的坐标为(2,2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/0.png)
),直线AB为⊙O的切线,B为切点.则B点的坐标为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/images1.png)
A.(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/2.png)
)
B.(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/3.png)
,1)
C.(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/5.png)
)
D.(-1,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963014_ST/6.png)
)
查看答案
如图,在△ABC中,AB=BC=2,以AB为直径的⊙O与BC相切于点B,则AC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963013_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963013_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963013_ST/1.png)
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963013_ST/2.png)
D.2
查看答案
如图,两个同心圆的半径分别为3cm和5cm,弦AB与小圆相切于点C,则AB的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963012_ST/images0.png)
A.4cm
B.5cm
C.6cm
D.8cm
查看答案
如图,PA、PB是⊙O的切线,切点分别为A、B,点C在⊙O上,如果∠P=50°,那么∠ACB等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100850430596311/SYS201311031008504305963011_ST/images0.png)
A.40°
B.50°
C.65°
D.130°
查看答案