Respuesta :

DariusX
area is pi*r^2

so if area is 81pi, means r=9

diameter is 2*pi*r =2*pi*9=18pi
HomeworkPotato123
To get the radius multiply 254.34 by 2 which is 508.68 and to get the radius you divide 254.34 by 2 and you get 127.17