To make a cylindrical tin bucket without cover, its bottom circumference is 9.42 decimeters, and its height is 4 decimeters. How many square decimeters of tin do you need? How many liters of water can you hold? To keep integers, you have to have a good formula

42 × 4 = 44. 745 or r = C / 2 π = 9. 42 / 2 π = 4. 71 / π (decimeter) s bottom = π [(4. 71 / π) ^ 2] = 22. 1841 / π (square decimeter) s side = 9. 42 * 4 = 37. 68 (square decimeter) s total = s bottom + s side = 22

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