The article sadly misses the root of the An sizes. A0 has an area of 1m^2, setting its dimensions and defining the rest of the sizes. Quite genius!
The B sizes start at B0 with a length on the short side of 1m, then follow the same pattern. The C sizes, often used for envelopes, are defined as the geometric mean between the equivalent A and B size.
As a child of an architect, when I was a kid my dad would bring old A0 drawings home as paper we could draw and paint on the back of. Loved it.
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Edit: it does mention it, I skimmed it too fast…
The B sizes start at B0 with a length on the short side of 1m, then follow the same pattern. The C sizes, often used for envelopes, are defined as the geometric mean between the equivalent A and B size.
As a child of an architect, when I was a kid my dad would bring old A0 drawings home as paper we could draw and paint on the back of. Loved it.
- Edit: it does mention it, I skimmed it too fast…