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Base data: Name.
Standard dimensions of paper according to JIS
Ratio does not change even when folded in two
The standard aspect ratio of A4 and B5 sizes is 1:√2 and that ratio does not change even when folded in two. Pretty amazing, huh? Both A4 and B5 sizes have an original A0 and B0 size, and they are cut at the same aspect ratio from there without waste.
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