Comment by lutusp

American: "Wow -- yet another example of practical math linked to everyday sources."

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."