if a=452.16 sq. ft, what is r USE 3.14 FOR PI

I assume this is the area of a circle.....if so, we have

452.16 =  pi *  r^2

452.16  =  3.14 * r^2        divide both sides by 3.14

452.16 / 3.14   =  r^2       

144  = r^2                     take the positive square root of both sides

12 ft  =  r