In the adjoining figure, O is the centre of the circle. If ∠OAB = 40°, then ∠ACB is equal to :
A. 50°
B. 40°
C. 60°
D. 70°
Answer:A
In the adjoining figure, O is the centre of the circle. If ∠OAB = 40°, then ∠ACB is equal to :
A. 50° B. 40° C. 60° D. 70°