题目内容
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=( )
A. 30° B. 40° C. 50° D. 60°