Given that O is the centre of circle.
Triangle ABC is an equilateral triangle
∠A = ∠B = ∠C = 60°
We Know that,
An angle subtended by an arc at the centre of the circle is double the angle subtended at any point on the circle.
∠BOC = 2 ∠BAC
∠BOC = 2 ∠A
∠BOC = 120°
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