As shown in the figure, given the angle of circumference angle A = 50.0, then the size of angle OBC is ()
Choices:
A:50°
B:40°
C:130°
D:80°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, given the angle of circumference angle A = 50.0, then the size of angle OBC is ()
Choices:
A:50°
B:40°
C:130°
D:80°
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, given the angle of circumference angle A = 50.0, then the size of angle OBC is ()
Choices:
A:50°
B:40°
C:130°
D:80°