The author has developed this didactic book specifically for students to teach them geometry.
In Chapter 1 Hisashi Abe shows boxes in different proportions based on different output formats. In Chapter 2 he explains the interior angle set. In chapters 3 and 4 he deals with balloon and windmill folds based on triangular, square, rectangular, pentagonal, hexagonal and octagonal formats. In Chapter 5 he shows how to fold the Masu box from square and rhombus and he shows a self-closing box. Chapter 6 shows boxes with square bottom in different proportions. In chapter 7 he explains the binomial formulas by means of the cubes and cuboids shown on the title page. Chapters 7 and 8 present a puzzle and practical origami.
Difficulty level: easy to medium