Four-tenths of a metre.
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pi * radius2 * height = 50265.482 cu cm ( 50.265482 litres)
V = 37,700 cm3
20 * 25 * 40 = 20,000 cc = 20 liters
Area = 1/2 X base X height Area = 1/2 X 40cm X 25cm Area = 500 square cm
The volume of a cylinder is the area of its base's area times the height (you will prove this in Calculus). Thus the formula you need to use is: pi * radius^2 * height. I will let you do your own homework from there.