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Problem 71. Cyclic Quadrilateral, Angles. Level: High School, SAT Prep, College

In a cyclic quadrilateral ABCD prove that each exterior angle is equal to the opposite interior angle. Post a comment or solution.
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		Proposed Problem 72: Intersecting Circles. Cyclic quadrilateral, Chords, Parallel.
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		Proposed Problem 69: Square inscribed in a triangle, Similarity.
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