Geometry - Cyclic Quadrilaterals

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Three points A,B,C lie on the circumference of the circle, with center as O. If angle(ACB) = 115 deg. Need to find angle (BOC)? Please post your approach?

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You cannot find the angle $BOC$, though you can find the angle $BOA$ which is $360^\circ-2\times115^\circ$

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