In the figure given below, DE is a tangent to the circle with centre O. If ∠ACD = 50° and ∠AOB = 140°, find the value of ∠OAC.
1
30°
2
40°
3
50°
4
60°
In the figure given below, DE is a tangent to the circle with centre O. If ∠ACD = 50° and ∠AOB = 140°, find the value of ∠OAC.