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CURIOSCOPE360 on Instagram: "Why A4 Paper Has a Magic Ratio! 📏✨ The A-series paper format (A4 to A0) is designed using the ISO 216 standard, which is based on a precise geometric principle: the aspect ratio of every sheet is √2 : 1 (≈1.414). This ratio is unique because when a sheet is cut or folded exactly in half, the resulting piece retains the same aspect ratio as the original. That means: • A4 (210 × 297 mm) folded → becomes A5 • A4 doubled → becomes A3 • A3 doubled → becomes A2 • …continu

70 Sekunden Wiki on Instagram: "#din #a4 #paper #germany [Q1] DIN Media – DIN EN ISO 216 [Q2] Heise – Zahlen bitte: DIN 476 – Die Geburt des wichtigsten Papierformats der Welt [Q3] DIN – Geschichte der Papierformate [Q4] Kryptografie.de – Wurzel-2-Nachkommastellen [Q5] Spiegel – Warum ist die Wurzel aus 2 irrational? [Q6] Saxoprint – Papierformate erklärt [Q7] Adobe – Guide to Paper Sizes [Q8] Papersizes.io – US Paper Sizes Overview"