Origami + Mathematics = Origamics
The Origamics was invented and coined by its inventor a biologist Prof Kazuo Haga (Japan) in 1994.
Haga’s First Theorem
Fold a square paper of size 1 unit x 1 unit: join the right-bottom vertex to the mid-point of the top edge.
This one fold creates respective edge points which mark out various ratios:
Without ruler, this is the most accurate way to obtain length of
As summarized in the diagram: