问题:
如图,已知∠ACB是⊙O的圆周角,∠ACB=50°,则圆心角∠AOB是( )
A.40°
B.50°
C.80°
D.100°
如图,已知∠ACB是⊙O的圆周角,∠ACB=50°,则圆心角∠AOB是( )
A.40° | B.50° | C.80° | D.100° |
参考答案: