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Answer :

15.6 cmSolution :

`(4)/(3) pi xx 7.8 xx 7.8 xx 7.8 = (1)/(3) xx pi xx r^(2) xx 31.2 rArr r^(2) = (4 xx 7.8 xx 7.8 xx 7.8)/(31.2)` <br> `:. r = 7.8 rArr d= 2r = 15.6 cm`