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dan v2 memiliki jari-jari r
R=3r
maka :
v1-v2= (1/3πR²t)-(1/3πr²t)
= (1/3π(3r)²t)-(1/3πr²t)
= (1/3π9r²t)-(1/3πr²t)
= (9/3-1/3)πr²t
= 8/3 πr²t
v=pi x r xr xt ,maka jika berubah 3r ,menjadi 9 kalinya karena 3r x 3 r = 9r