To make a cylindrical tin bucket without cover, its bottom radius is 2 decimeters, and its height is 5 decimeters. How many square decimeters of tin do you need? What's the capacity of the bucket? (the thickness of iron sheet is not included)

To make a cylindrical tin bucket without cover, its bottom radius is 2 decimeters, and its height is 5 decimeters. How many square decimeters of tin do you need? What's the capacity of the bucket? (the thickness of iron sheet is not included)

2 × 3.14 × 2 × 5 + 3.14 × 22 = 12.56 × 5 + 3.14 × 4 = 62.8 + 12.56 = 75.36 (square decimeter); 3.14 × 22 × 5 = 3.14 × 4 × 5 = 62.8 (cubic decimeter); answer: need iron sheet 75.36 square decimeter, the volume of bucket is 62.8 cubic decimeter

Make a cylindrical tin bucket without cover, with a bottom radius of 2 decimeters and a height of 5 decimeters. How many square decimeters of tin will be used to make this bucket

Bottom area s = 3.14 * 2 ^ 2 = 12.56
Side area s = 3.14 * 2 * 2 * 5 = 62.8
The bucket is made of iron sheet 12.56 + 62.8 = 75.36

To make a cuboid bucket with a length of 3 decimeters, a width of 1.3 decimeters and a height of 3 decimeters, you need at least () square decimeters of iron sheet,
Its volume is ()

1.5x3x3=13.5