Go Geometry Problem Problem 465: Square, Arc, Angle, 90 Degrees, Measurement

Problem 465. The figure shows a square ABCD. It contains arcs AEC and BFD drawn with centers at D and A, respectively. The measure of angle AEF is 90 degrees, AE = a, EF = b, and DF = x. Prove that Formula to prove
 

Square, Circle, 90 Degrees, Measurement
 

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