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Vtabung = Πr²t
dari soal didapat:
Π=22/7
r=21
t=42=2r
Vbola = 4/3Πr³
maka:
Πr²t -4/3Πr³
Πr²(2r) -4/3Πr³
2Πr³ - (4/3)Πr³
Πr³(2-4/3)
22/7*21³ (6-4/3)
22/7*21³*2/3=19404