A-size paper have a really cool property. If divide in half, taking the smaller side, we can two sheets of paper with one A size smaller.
Why? [MATH AHEAD] Because of the ratio i.e 1 : √2 . If you divide this ratio(fraction) in half, then it becomes 1/2 : √2/2 . On simplifying, it becomes √2 : 1 which is same as 1 : √2, on rotating the sheet by 90°. I got to know about this in David Brill's book -Brilliant Origami. Sincerely, Bharat. On Mon, 22 Jul, 2019, 5:22 PM Kathy Stevick, <kfstev...@gmail.com> wrote: > leslie wrote > If all A sized paper is proportionally the same, why couldn’t you fold any > model that calls for A-Sized paper? It would be the same as folding models > from different sized squares. The model would only vary in size whether it > was folded from A-8, or A-5...or any A sizes larger or smaller. Right? > > Right but things get small really fast. > Kathy