Let me introduce to you: the IKEA paper tape measure, folded neatly in your wallet.
(read the article)
It's a good exercise in thinking, dhy that is so.
European: "Yes, but not your everyday sources."
1190mm (A0 height) / 841mm (A0 width) ⩰ √2
11" (US letter height) / 8.5" (US letter width) = 1.29411 ...
Countries using the Metric system: 192
Countries using the Imperial system: 3 (U.S., Liberia, Myanmar)
The U.S. rejection of the Metric system can be traced to Thomas Jefferson, who declared it "Too French."
Lol