Text by Jane Rosemarin
In July 2022, Arnold Tubis sent The Fold instructions for folding a square to form an accurate heptagon, with only a single cut. He also submitted diagrams for three heptagonal brooches, which we published in two articles ( part 1 and part 2.)
Shortly thereafter, Arnold asked if I would care to publish a series of brooches made from paper shapes with ascending numbers of sides, beginning with the triangle. I happily agreed, and in the coming year, we will be publishing diagrams for brooches made from three- to eight-sided shapes, skipping over the already published heptagons.
In this article are the first two brooches from equilateral triangles and diagrams showing how to make an equilateral triangle from a square, employing a single cut.
I hope you enjoy folding the brooches and that you find the shape-cutting techniques useful when you fold other models.