满分5 >
初中数学试题 >
(2002•兰州)如图,A、B、C三点是⊙O上的点,∠ABO=55°,则∠BCA...
(2002•兰州)如图,A、B、C三点是⊙O上的点,∠ABO=55°,则∠BCA为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931027_ST/images0.png)
A.70°
B.50°
C.45°
D.35°
考点分析:
相关试题推荐
(2002•三明)如图,四边形ABCD为⊙O的内接四边形,若∠ABC=125°,则∠AOC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931026_ST/images0.png)
A.55°
B.110°
C.105°
D.125°
查看答案
(2002•十堰)如图,在△ABC中,∠C=90°,∠A=30°,BE是∠B的平分线,以AE为直径的圆O交AB于D,则图中相似三角形有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931025_ST/images0.png)
A.6对
B.5对
C.4对
D.3对
查看答案
(2002•潍坊)正方形ABCD内接于⊙O,P是劣弧
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931024_ST/0.png)
上任意一点,则∠ABP+∠DCP等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931024_ST/images1.png)
A.90°
B.60°
C.45°
D.30°
查看答案
(2002•烟台)⊙O上有A、B、C三点,若弦AC的长恰好等于⊙O的半径,则∠ABC的度数为( )
A.30°
B.60°
C.150°
D.30°或150°
查看答案
(2002•泸州)如图,在⊙O中,圆心角∠AOB=48°,则圆周角∠ACB的度数是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232550768293138/SYS201310212325507682931022_ST/images0.png)
A.48°
B.24°
C.36°
D.96°
查看答案