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2.phi.r = 66
2.22/7.r = 66
44/7.r = 66
44.r = 66 . 7
44.r = 462
r = 462 : 44
r = 10,5 cm
jadi,
V = 1/3.phi.r².t
= 1/3.22/7.(10,5)².30
= 10.22/7.110,25
= 10.22.15,75
= 3465 cm kubik