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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Buy Graph Paper Composition Notebook: Graph Paper Notebook for Math and Science Students | 120 Quad Ruled 5x5 Pages | Size 8.5 x 11 inches (Grid Paper

Graph Paper Composition Notebook: Graph Paper Notebook for Math and Science Students | 120 Quad Ruled 5x5 Pages | Size 8.5 x 11 inches (Grid Paper

Graph Paper for Maths and Science

The Mathematics Behind A4 Paper - Why is A4 Sized This Way?

A Paper Sizes - A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10

Mathematics Archives » Page 6 of 6 » Science ABC

Different Paper Sizes, Sizes Explained

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

Math Notebook 1/2 Inch Squares: Graph Paper Composition Notebook for Kids and Students | Grid Paper for Math and Science Paperback| Large Size 8.5x11

Math Notebook 1/2 Inch Squares: Graph Paper Composition Notebook for Kids and Students || Grid Paper for Math and Science Paperback| Large Size 8.5x11

How Many Times Can You Fold A Piece Of Paper In Half?