Fencing encloses a rectangular backyard that measures 200 feet by 800 feet. a blueprint of the backyard is drawn on the coordinate plane so that the rectangle has vertices (0,0) (0,40) (10,40) and (10,0).

a circular flower garden is dug to be exactly in the center of the backyard, with a radius of 60 feet.

what is the equation of the flower garden represented on the blueprint?

(x _ _)^2 + (y _ _)^2 = _