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1) volume of material required for any solid is given by the formula
(outer volume - inner volume)
here outer volume V = 4/3*pi*(8.3)³
and inner volume v = 4/3*pi*(6.6)³
therefore volume of material = V - v
=> 4/3*22/7*[ 8.3³ - 6.6³]
=> 88/21*[ 571.787 - 287.486 ]
=> (88×284.3)/21
=> 1178.8 cu cm
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