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A hollow cylindrical pipe is 21 cm long. If its outer and inner diameters are 10 cm and 6 cm, then
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A hollow cylindrical pipe is 21 cm long. If its outer and inner diameters are 10 cm and 6 cm, then
the volume of the metal used in making pipe is (cm3
)
the volume of the metal used in making pipe is (cm3
)
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