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= 4 x 22/7 x 21 x 21
= 88 x 63
= 5.544 cm2
b. V = 4/3 phi r x r x r
= 4/3 x 22/7 x 21 x 21 x 21
= 38.808 cm3
b). V=1/6 πd³=1/6×22/7×42×42×42=38808 cm³