Story of A4

You all know the A4 papers. But do you know why are they called A4 or why are they so special? Well, there’s a very interesting fact about these. If you cut an A4 paper in half (the larger side should be cut), you’ll get two mini versions of A4 papers. That means the ratio of height to width of the small papers will be the same as the original A4 paper.

This is a companion discussion topic for the original entry at