Surface area =
2 * pi * (diameter / 2)^2 + 2 * pi * (diameter / 2) * height ......so we have...
2 * pi * ( 8/2)^2 + 2 * pi * (8 / 2) * 16 =
2 * pi * (4)^2 + 2 * pi * (4) (16) =
2 * pi [ 4^2 + 4 * 16]
2 *pi (16 + 64) =
2 pi ( 80) =
160 pi mm ^2 ≈ 502.65 mm^2
