We need to find the radius, r......so the area =

422.7 = pi * (radius)^2 divide both sides by pi

[422.7 / pi] = r^2 take the positive root of both sides

sqrt [ 422.7 / pi ] = r

And the circumference = 2 *pi * r =

2 *pi * sqrt [2 422.7 / pi ] ≈ 72.88 ft.