A cylinder's volume is π r² h, and its surface area is 2π r h + 2π r². Since there is no length and radius. Let is denote the length by 80 mm and 0.30 mm radius.
Surface area, A = 2 (pi) r * 80 = 160(pi)r
dA / dr = 160 (pi)
160.0π mm^2/mm is the answer.
