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π . . t = 4/3 π x 2
3.14 x x t = 4/3 x 3.14 x x 2
3.14 x 900 x t = x 2
2826 x t = 7234,56 x2
2826 x t = 14469,12
t = 14469,12 / 2826
t = 5,12 cm