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The external and internal radii of a hollow right circular cylinder are 5 cm and 4 cm respectively.

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The external and internal radii of a hollow right circular cylinder are 5 cm and 4 cm respectively. If the volume of metal used to make it is 198 cm3, find the height of cylinder.

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Given 

External radius of hollow cylinder r1 = 5 cm

Internal radius (r1) = 4 cm.

Volume of hollow cylinder = 198 cm3

Hence height of cylinder = 7 cm

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