满分5 >
初中数学试题 >
(2001•嘉兴)已知⊙O的半径是4,P是⊙O外的一点,且PO=8,从点P引⊙O...
(2001•嘉兴)已知⊙O的半径是4,P是⊙O外的一点,且PO=8,从点P引⊙O的两条切线,切点分别是A,B,则AB=( )
A.4
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486013_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486013_ST/1.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486013_ST/2.png)
考点分析:
相关试题推荐
(2001•武汉)如图,圆内接△ABC的外角∠ACH的平分线与圆交于D点,DP⊥AC,垂足是P,DH⊥BH,垂足是H,下列结论:①CH=CP;②AD=DB;③AP=BH;④DH为圆的切线.其中一定成立的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486012_ST/images0.png)
A.①②④
B.①③④
C.②③④
D.①②③
查看答案
(2001•海南)已知正三角形的边长为3,则它的外接圆的面积为( )
A.3π
B.6π
C.9π
D.
查看答案
(2001•天津)如图,已知△ABC为等腰直角三角形,D为斜边BC的中点,经过点A、D的⊙O与边AB、AC、BC分别相交于点E、F、M.对于如下五个结论:①∠FMC=45°;②AE+AF=AB;③
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486010_ST/0.png)
;④2BM
2=BE•BA;⑤四边形AEMF为矩形.其中正确结论的个数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486010_ST/images1.png)
A.2个
B.3个
C.4个
D.5个
查看答案
(2001•甘肃)在⊙O中,一条弦的弦心距为3,⊙O的半径是5,则这条弦的长为( )
A.4
B.6
C.8
D.
查看答案
(2001•内江)已知⊙O的半径为3,△ABC内接于⊙O,AB=3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486008_ST/0.png)
,AC=3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486008_ST/1.png)
,D是⊙O上一点,且AD=3,则CD的长应是( )
A.3
B.6
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486008_ST/2.png)
D.3或6
查看答案