问题:
如图,⊙O外接于△ABC,AD为⊙O的直径,∠ABC=30°,则∠CAD=
[ ]
A.30°
B.40°
C.50°
D.60°
如图,⊙O外接于△ABC,AD为⊙O的直径,∠ABC=30°,则∠CAD=
B.40°
C.50°
D.60°
[ ]
A.30° B.40°
C.50°
D.60°
参考答案: