The point O is the center of the circle circumscribed about \triangle A B C, with \angle B O C= 120^{\circ} and \angle A O B=140^{\circ}, as shown. What is the degree measure of \angle A B C ?
Answer Choices
A. 35
B. 40
C. 45
D. 50
E. 60
The point O is the center of the circle circumscribed about \triangle A B C, with \angle B O C= 120^{\circ} and \angle A O B=140^{\circ}, as shown. What is the degree measure of \angle A B C ?
Answer Choices
A. 35
B. 40
C. 45
D. 50
E. 60