题目内容
试题答案
C
如图,点C在⊙O上,若∠ACB=40°,则∠AOB等于( )
如图,A、B、C三点在⊙O上,且∠AOB=80°,则∠ACB等于( )
A.100° B.80° C.50° D.40°
A.40° B.60° C.80° D.100°