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Make a cylindrical iron bucket without cover, 30cm in height and 10cm in diameter at the bottom. How many iron sheets do you need at least to make this bucket?
3.14 × (10 △ 2) 2 + 3.14 × 10 × 30, = 78.5 + 942, = 1020.5 (square centimeter); answer: to make this bucket, at least 1020.5 square centimeter iron sheet is needed
A cylindrical tin bucket without cover is 30cm high and the bottom radius is 10cm. How many square centimeters of tin should be used to make the bucket?
10x10x3.14 + 10x2x3.14x30 = 314 + 1884 = 2196 cm2
A cylindrical tin bucket without cover, 30 cm high, bottom radius 10 cm, to make 100 such buckets need at least () square meters of tin
A cylindrical tin bucket without cover needs iron sheet
3.14 x10 x10+2x3.14 x10 x30
=2198 sq cm = 0.2198 sq m
It takes at least 0.2198 square meters to make 100 such barrels x 10 0 = 21.98 square meters
To make 100 such barrels, it needs at least (21.98) square meters of iron sheet
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