Standard paper sizes are an elegant example of simple maths
A4 Paper / International Standard Paper Sizes
Why A4? – The Mathematical Beauty of Paper Size - Heidelberg Laureate Foundation
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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A4 Format | A4 paper size & Uses | A-Series Paper | Adobe