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---- = ----------
V₂ π.r₂².t₂
V₁ r₁². t₁
---- = [ --- ] [--- ]
V₂ r₂². t₂
V₁
---- = [ 9/8 ]² [ 14/14]
V₂
∴ V₁ : V₂ = 81 : 64
v1 : v2 = (9 x 9) : (8 x 8) = 81 : 64