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= π x r² x t x 3/4
= 22/7 x 21 x 21 x 89 x 3/4
= 92.515,5
= 22/7 x 21 x 21 x 89 = 123354 cm³
karena yang di tanya 3/4 nya maka : 123354 : 3/4 = 92515,5 cm³