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jari-jari tabung = 21 : 2 = 10,5 cm
jari2 bola = 21 : 2 = 10,5 cm
v bola = x x = x x = 4.851
v tabung = x x t = x x 21 = 7.276,5
v ruangan dalam tabung diluar bola = v tabung - v bola = 4.851 - 7.276,5 = 2.425,5 (a)