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Online Geometry Problem 460: Circle, Tangent, Perpendicular, Radius, Distance, Measurement

The figure shows a circle O with the radius OA perpendicular to radius OB. Line CD is tangent to circle O at E. AF and BG are perpendicular to CD. If OA = x, AF = a, and BG = b, prove that Formula to prove.

Circle, tangent, perpendicular, radius





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