How many square decimeters does it take to make a cylindrical iron bucket with a height of 6 decimeters and a bottom radius of 1.8 decimeters? (ten square decimeters reserved)
The side area of the bucket: 3.14 × 1.8 × 6 × 2 = 67.824 (square decimeter), the bottom area of the bucket: 3.14 × 1.82 = 3.14 × 3.24 = 10.1736 (square decimeter), the surface area of the bucket: 67.824 + 10.1736 ≈ 80 (square decimeter); a: it takes about 80 square decimeters of iron sheet to make such a bucket
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