Question 1175506
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If a quadrilateral is inscribed in a circle, the pairs of its opposite angles are supplementary angles.


In other words, if a quadrilateral is inscribed in a circle, the pairs of its opposite angles sum up to 180°.


Thus ULK + UCK = 180°,  ULK = 180° - UCK = 180° - 77° = 103°.      <U>ANSWER</U>
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