As shown in the figure, in circle O, chord AC parallel radius OB, angle BOC = 50.0, then the degree of angle OAB is ()
Choices:
A:25°
B:50°
C:60°
D:30°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, in circle O, chord AC parallel radius OB, angle BOC = 50.0, then the degree of angle OAB is ()
Choices:
A:25°
B:50°
C:60°
D:30°
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, in circle O, chord AC parallel radius OB, angle BOC = 50.0, then the degree of angle OAB is ()
Choices:
A:25°
B:50°
C:60°
D:30°