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並前往https://blog.doublehelix.csiro.au/why-is-a4-paper-the-size-that-it-is/

Why is A4 paper the size that it is? - Double Helix magazine

As David pointed out, the dims are 841 x 1189, same proportion as an A4 sheet, ie the long side is 1.4142135 times the length of the short side.

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