* The box has dimensions of 10cm by 20cm. So the surface area is: ** Front and back: 10cm x 20cm = 200cm^2 each ** Sides: 10cm x 10cm = 100cm^2 each ** Total surface area = 200cm^2 + 200cm^2 + 100cm^2 + 100cm^2 = 600cm^2 * There will need to be overlaps where the paper is folded and stuck. Let's assume 1cm overlaps on each side. * So total paper needed = Surface area + (4 sides x 1cm overlap) = 600cm^2 + 40cm = 640cm^2 * For ribbon, you need enough to go