Why is A4 paper 297×210 mm? Math! Ratio = √2 ≈ 1.414213562 so folding preserves proportions. Let r = L/W. Halve long side: new ratio = 2/r. Set r = 2/r → r² = 2 → r = √2! A0 = 1 m². Beautiful design!
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Why is A4 paper 297×210 mm? Math! Ratio = √2 ≈ 1.414213562 so folding preserves proportions. Let r = L/W. Halve long side: new ratio = 2/r. Set r = 2/r → r² = 2 → r = √2! A0 = 1 m². Beautiful design!
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