Each of a design's "flaps"—an area of the paper that is to become a leg or an antenna, for instance—is represented by a circle or a strip. Circles are drawn, or "packed," onto a square piece ...

2D shapes can be found printed in a book or you can draw them on a piece of paper. 2D shapes have sides ... Now let’s look at a square. A square has 4 sides and 4 vertices.