Since it is given that AOC = 110° and by the theorem:-

The angle formed at the centre of a circle by an arc, is double of the angle formed by the same arc at any point on circle.

Since APCB forms a cyclic quadrilateral and we know that sum of opposite sides of a cyclic quadrilateral is equal to 180°

APC + ABC = 180

ABC = 180 – 55 = 125°

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