满分5 >
初中数学试题 >
(2003•山西)如图,AB、AC与⊙O相切于B、C,∠A=50°,点P是圆上异...
(2003•山西)如图,AB、AC与⊙O相切于B、C,∠A=50°,点P是圆上异于B、C的一动点,则∠BPC的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853029_ST/images0.png)
A.65°
B.115°
C.65°和115°
D.130°和50°
考点分析:
相关试题推荐
(2003•武汉)如图,已知⊙O
1、⊙O
2相交于A、B两点,且点O
1在⊙O
2上,过A作⊙O
1的切线AC交BO
1的延长线于点P,交⊙O
2于点C,BP交⊙O
1于点D,若PD=1,PA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853028_ST/0.png)
,则AC的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853028_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853028_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853028_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853028_ST/3.png)
D.
查看答案
(2003•武汉)如图,已知,PD为⊙O的直径,直线BC切⊙O于点C,BP的延长线与CD的延长线交于点A,∠A=28°,∠B=26°,则∠PDC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853027_ST/images0.png)
A.34°
B.36°
C.38°
D.40°
查看答案
(2008•泸州)如图,PA切⊙O于点A,PO交⊙O于点B,若PA=6,BP=4,则⊙O的半径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853026_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853026_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232416290285382/SYS201310212324162902853026_ST/1.png)
C.2
D.5
查看答案
(2003•甘肃)已知⊙O的半径为r,圆心O到一直线l的距离为d,直线l和⊙O相交时,下面的四个式子中,正确的一个是( )
A.r=d
B.r<d
C.r≤d
D.d=0
查看答案
(2003•金华)已知直线l与⊙O相离,如果⊙O半径为R,O到直线l的距离为d,那么( )
A.d>R
B.d<R
C.d=R
D.d≤R
查看答案