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8.Diameter of base of cylinder = d = 21 cmRadius of base of cylinder = r = d2 = 212 cmHeight of cylinder = h = 10 cmVolume of cylinder = πr2h=227 × 212×212×10=3465 cm3

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which one 8th or 9th
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diameter = 21 so, radius = 21/2 = 10.5
volume of cylinder = πr2h
volume = 22/7 * 10.5 * 10.5 * 10
volume of cylinder = 3465 cm2
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