What's The Mathematical Logic Behind Different A-Size Papers

What's the logic behind deciding different paper sizes? How do we determine the exact length and breadth of A4 sheets and how are these standardized?
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US Paper Sizes Explained. The difference between A4 and Letter.

A4 Kağıdı Boyutu Neden Tam Değer Değildir?

What's The Mathematical Logic Behind Different A-Size Papers? » Science ABC

Logical reasoning - Wikipedia

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Different Paper Sizes, Sizes Explained

Paper Sizes and Formats, the Difference Between A4 and Letter