The quadrilateral ABCD is inscribed in a circle. The ABC angle is 80 degrees, the CAD angle is 54 degrees. Find the angle ABC.
A drawing is needed here to correctly determine the inscribed and center angles. The inscribed corners are equal to half of the arc on which they rest. I suspect that a mistake was made in the condition. the desired angle is given to us by condition.
And so the answer: angle ABC = 80
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