wholesale kraft cotton filled gift boxes jewelry cardboard box How much hard paper does a cylindrical gift box with a diameter of 20 cm high in diameter?

wholesale bioflex body jewelry The minimum situation is that the surface area of ​​the cylindrical shape is just the hard -required hard paper.
The surface area is divided into a rectangular shape of the upper and lower circles and side area. r ryle is PIR2, so the two are 2 × Pi × 10 ＾ 2≈2 × 3.14 × 10 × 10 = 628cm2
. A wide rectangle. The area is h × dpi = 50 × 20 × 3.14 = 3140cm2
, at least 628 3140 = 3768cm2 hard cardboard