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r₁ : r₂ = 1 : 3
ditanya
L₁ : L₂ = ....
jawab
L₁ : L₂ = 4 π r₁² : 4 π r₂²
L₁ : L₂ = 4 π (1)² : 4 π (3)²
L₁ : L₂ = (1)² : (3)²
L₁ : L₂ = 1 : 9
L₁ : L₂ = 1 : 9
jadi, L₁ banding L₂ = 1 : 9