show that points are concyclic
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Theorem: If the segment joining two points A and B subtends equal angles at two other points C and D on the same side of AB, then the four points are concyclic. Consider the following figure, which shows how C and D lie on the same side of AB, and that∠ACB=∠ADB ∠ A C B = ∠ A D B . Will A, B, C and D be concyclic?
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