满分5 >
初中数学试题 >
(2002•朝阳区)已知:如图,⊙O半径为5,PC切⊙O于点C,PO交⊙O于点A...
(2002•朝阳区)已知:如图,⊙O半径为5,PC切⊙O于点C,PO交⊙O于点A,PA=4,那么PC的长等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975005_ST/images0.png)
A.6
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975005_ST/0.png)
C.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975005_ST/1.png)
D.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975005_ST/2.png)
考点分析:
相关试题推荐
(2002•福州)如图:PA切⊙O于点A,PBC是⊙O的一条割线,且PA=3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975004_ST/0.png)
,PB=BC,那么BC的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975004_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975004_ST/1.png)
B.3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975004_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975004_ST/3.png)
D.2
查看答案
(2002•咸宁)如图,已知P为⊙O外一点,PO交⊙O于点A,割线PBC交⊙O于点B、C,且PB=BC,若OA=7,PA=4,则PB的长等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975003_ST/1.png)
C.6
D.
查看答案
(2002•浙江)如图,⊙O的两条割线PAB,PCD分别交⊙O于点A,B和点C,D.已知PA=6,AB=4,PC=5,则CD=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975002_ST/1.png)
C.7
D.24
查看答案
(2002•南昌)如图,PA切⊙O于A,PB切⊙O于B,OP交⊙O于C,下列结论中,错误的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975001_ST/images0.png)
A.∠1=∠2
B.PA=PB
C.AB⊥OP
D.PA
2=PC•PO
查看答案
(2002•佛山)如图,直线AB切⊙O于点A,割线BDC交⊙O于点D、C.若∠C=30°,∠B=20°,则∠ADC=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768697502/SYS201310212325507686975000_ST/images0.png)
A.70°
B.50°
C.30°
D.20°
查看答案