Mastodawn

Nanoraptor Mar 13

iso paper sizes are delicious: sides are 1:sqrt2 or about 1:1.414

A4 is 210x297mm

A4 folded in half is 148x210 or A5.

A3 is two A4s, or 297x420

go to A0 841x1189 or one square metre.

A-1 (A Minus One) is 2 square metres.

Australia is ~A-43

The visible universe ~A-179

A proton about A139.

A Quark? A151

Presumably A232 is one dimensional though, as it's planck length on the long edge.

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Slash909uk Mar 14

@NanoRaptor i am here for this 😁

Also sizes above A0 seem to have a different notation, at least here:

https://www.papersizes.org/a-paper-size-areas.htm

Thus Oz is 43A0. you're welcome 🤪

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

Areas of the A series paper sizes 4A0, 2A0, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10 in square metres, square centimetres, square millimetres, square inches, and sqaure feet.

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Nanoraptor

@Slash909uk aye I’ve seen both used. And only printed two double A0 posters in fifteen years where I am. Once they’re up around that size they tend to be rounded to sizes like 1800x1200 or so.