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t₂ = 2t₁ --> t₁ = 1/2 t₂
V₁ = 1/3 π r₁² t₁
V² = 1/3 π r₂² t₂
V₁ : V₂ = r₁² t₁ : r₂² t₂
V₁ : V₂ = (3 r₂)² .(1/2 t₂) : (r₂)² (t₂)
V₁ : V₂ = (9)(1/2) : 1 = 9 : 2