As shown in the figure, it is known that OA = OB = OC and angle ACB = 30.0, then the size of angle AOB is ()
Choices:
A:40°
B:50°
C:60°
D:70°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, it is known that OA = OB = OC and angle ACB = 30.0, then the size of angle AOB is ()
Choices:
A:40°
B:50°
C:60°
D:70°
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: As shown in the figure, it is known that OA = OB = OC and angle ACB = 30.0, then the size of angle AOB is ()
Choices:
A:40°
B:50°
C:60°
D:70°