the base radius of an iron cylinder is 15cm and its height is 32cm.it is melted and react into 2 cylinder of base radius 20cm.what is the height of second cylinder?
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9 cm.because,the volume of the main iron cylinder is π×15×15×20 cm^3.And the total volume of the new cylinders is 2×π×20×20×h cm^3.if we think the height be h cm. Then as π×15×15×20=2×π×20×20×h , hence h=9 cm.
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