Different shapes and Origami

(the world of 2-dimensions)

(1) Folding Equi-polygon

When you fold a sheet of paper you will get all kinds of different shapes. There are polygons that have the equal sides and angles. Try some of these.

(a) An equilateral triangles

(b) A square

(c) A pentagon
　　When the diagonals of the pentagon are 2 in portion, their sides would 　　be √5−1. It will leads you to fold the pentagon

(d) If you are interested in this, you can check other references.

2-ddevide