Fencing encloses a rectangular backyard that measures 200 feet by 600 feet. A blueprint of the backyard is drawn on the coordinate plane so that the rectangle has vertices (0,0), (0,30), (10,30), and (10,0).
A circular flower garden is dug to be exactly in the center of the backyard, with a radius of 40 feet. This garden is represented on the blueprint.
What is the equation of the flower garden represented on the blueprint?
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(x[])^2+(y[])^2=[]