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 A of the rectangular field shaded green as a function of r A r b Determine the maximum area enclosed by the rectangular field Type pl if you need it or look in the MathPad Gre list Decimal approximations are marked incorrect Maximum area square meters X