Home Geometry Problems 71-80 Common Chord Parallel Chords Solution / comment      By Antonio Gutierrez
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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