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4/3 x π x r³
4/3 x 22/7 x 7³
1437, 3 cm³
Vol 9 bola
9 x 1437, 3
12936 cm³
Berat 9 bola = 12936 x 10 gr = 12960 gr = 12,96 kg (dibulatkan jd 13 kg)