Question

9. In the figure, if angle ABC = 60°, then
angle AOC =
(A) 120° (B) 60° (C) 30° (D) 90°
А
0
60
B
​

Answer 1

Answer:

Step-by-step explanation:

We know that the angle at the centre of the circle is twice the angle at the circumference subtended by the same arc.

Thus,

  ∠AOC=2×∠ABC

⟹∠AOC=2×20  

⟹∠AOC=40