The figure below shows the tangent circles of diameters AB, BC, CD, and AD so that the line EFG is the common tangent to circles AB, BC, and CD at E, F, and G, respectively. If EF = a and FG = b, prove that the shaded area .
Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.
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Original problem 812.