Question: Let ABCD be a quadrilateral inscribed in a circle. Prove that the line segments AB and CD are parallel if and only if the arc

Let ABCD be a quadrilateral inscribed in a circle. Prove that the line segments AB and CD are parallel if and only if the arc between A and D not containing B has the same length as the arc between B and C not containing A.

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Question: Let ABCD be a quadrilateral inscribed in a circle. Prove that the line segments AB and CD are parallel if and only if the arc

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