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F₁ : F₂ = r₂² : r₁²
F₁ : 4F₁ = r₂² : r₁²
dalam kali dalam, luar kali luar
4F₁.r₂² = r₁². F₁
4r₂² = r₁²
r₂² = 1/4 r₁²
r₂ = √ (1/4 r₁²)
= 1/2 r₁
jarak = 1/2 x jarak mula2