system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does paper have weird sizes?

Why has paper those weird sizes, like an A4 is 210X297 (cm)? why isn't it better to have 210X300, or 200X300? I tought it would be easier to divide a paper with 200X300 than 210X297.
gpt
Basically, paper sizes have this quality where if you cut it in half, it retains the aspect ratio it originally has. You can try it by folding a normal sheet of A4. No matter how many times you fold it, the length of the sides will always be in the same ratio.