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r₂ = 1/3 d₁/2 = 1/6 d₁
r₁ = 1/2 d₁
l₂ = 2l₁
p = const
S = πr²
S₁ = π (1/2d₁ )²= 1/4 πd₁
S₂ = π (1/6 d₁)² = 1/36 πd₁