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.
Sparkpaws
5000
5000@raikou@donphan.social
Now to calculate the negative A-number for a universe-wrapping sheet.
March 13, 2026 at 9:53:50 PM
