What is the history behind standard paper sizes A4, A3, etc.? - Quora
A4 size in pixels. Convenient calculator with different DPIs.
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Paper size - Wikipedia
Scott Stanfield 🌻🚀 on X: "RT sides are a ratio of sqrt(2) @jasonlong: never realized there was a fractal structure to A3, A4, A5 paper sizes. http://t.co/B971Cbbspj" / X
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