As shown in the figure, points A, B, and C are all on circle O, when angle OBC = 40.0, the degree of angle A is ()
Choices:
A:50°
B:55°
C:60°
D:65°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, points A, B, and C are all on circle O, when angle OBC = 40.0, the degree of angle A is ()
Choices:
A:50°
B:55°
C:60°
D:65°
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, points A, B, and C are all on circle O, when angle OBC = 40.0, the degree of angle A is ()
Choices:
A:50°
B:55°
C:60°
D:65°