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r₁ : r₂ = 1 : 3 --> r₁/r₂ = 1/3
Luas tabung 1 : luas tabung 2 = (π r₁² t₁) : (π r₂² t₂)
= (r₁/r₂)² (t₁/t₂)
= (1/3)² (1)
= 1/9 = 1 : 9