如图,PA、PB是⊙O切线,A、B为切点,点C在⊙O上,
且∠ACB=55°,则∠APB等于( ).
A.55° B.70° C.110° D.125°
如图,PA、PB是⊙O切线,A、B为切点,点C在⊙O上,
且∠ACB=55°,则∠APB等于( ).
A.55° B.70° C.110° D.125°
b