题目内容
如图,△ABC内接于⊙O,AD是⊙O的直径,∠ABC=25°,则∠CAD的度数是( )
A.25° B. 60° C.65° D.75°
A.25° B.60° C.65° D.75°
如图,⊙O是△ABC的外接圆,若∠ABC=40,则∠AOC的度数为
A.20 B.40 C.60 D.80