in may , the grounds keeper at spring lake golf club built a circular green with an area of 81 π square feet . in august , he doubled the distance from the center of the green to the edge of the green . what is the total area of the renovated green ?
"area of circle 81 pi sq feet = pi r ^ 2 therefore r = 9 now green radi doubled i . e r = 18 area = 324 pi e"
circle_area(multiply(sqrt(81), const_2))