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4/3 × π × r³ = 381,51
4/3 × 3,14 × r³ = 381,51
12,56/3 × r³ = 381,51
r³ = 381,51 : 12,56/3
r³ = 381,51 × 3/12,56
r = ∛91,125
r = 4,5 cm