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**willjones2010** A rectangular field with base x and height 2r is surmounted by two semicircular fields, as shown in the diagram below. The external perimeter of the fields (solid blue track) is 200 meters. Answer the following:

a) Express the area of the rectangular field (shaded green) in terms of r

Area =

b) Determine the maximum area enclosed by the rectangular field. (Type "pi" if you need it, or look in the MathPad Greek list. Decimal approximations are marked incorrect.)

Maximum area = (square meters)

I do not know where to even begin on this problem if anyone could help me. Any explanation as to what strategy i should use would be awesome.