Paper? (2) How many cans does a factory need to produce 100 such cans?
(1) How many square decimeters of paper does it take to stick a circle of trademark paper along the side of this iron box?
The bottom circumference is
2×2×3. 14= 12.56 (decimeter)
Need paper
12.56×5=62.8 (square decimeter)
(2) How many cans does a factory need to produce 100 such cans?
The bottom area is
2×2×3. 14= 12.56 (square decimeter)
The transverse area is
2×2×3. 14×5=62.8 (square decimeter)
Every tin box needs tin.
12.56×2+62.8=87.92 (square decimeter)
* * * Need iron sheet
87.92× 100=8792 (square decimeter) =87.92 (square meter)