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Problem 72. Intersecting Circles, Cyclic Quadrilateral, Angles,
Parallel.
Level: High School, SAT Prep, College geometry. Given lines 1 and 2, circle 3 passes through the points A, B, C, and D,
and circle 4 passes through the points C, D, E, and F. Prove that lines
AB and EF are parallel.
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