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berarti jari-jari = 21/2
= 10,5 cm
Volume tabung = phi r2 x t
3.465 = 3,14 x 10,5 kuadrat x t
3.465 = 3, 14 x 110,25 x t
3.465 = 346,185 x t
t = 3.465 : 346,185
t = 10,01 cm
atau dibulatkan menjadi 10 cm