(3*2*c*pi*r^2-4*c*pi*r+12*pi*r)c for r=36 and c = (sqrt(768 pi+5184 pi^2)-72 pi)/(384 pi)(3*2*c*pi*r^2-4*c*pi*r+12*pi*r)c for r=36 and c = (sqrt(768 pi+5184 pi^2)-72 pi)/(384 pi)

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