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Volume tabung = πr²t
Karena sisi bola bersinggungan dengan tabung :
T = 2R
V.bola : V.tabung = 4/3πr³ : πr²(2r) = 4/3πr³ : π2r³
= 4/3 : 2
= 2 : 3
Vtabung = 3/2 x 60l = 90liter