2nd Edition

# Project Origami Activities for Exploring Mathematics, Second Edition

By Thomas Hull Copyright 2013
364 Pages 379 B/W Illustrations
by A K Peters/CRC Press

364 Pages
by A K Peters/CRC Press

364 Pages 379 B/W Illustrations
by A K Peters/CRC Press

Also available as eBook on:

Project Origami: Activities for Exploring Mathematics, Second Edition presents a flexible, discovery-based approach to learning origami-math topics. It helps readers see how origami intersects a variety of mathematical topics, from the more obvious realm of geometry to the fields of algebra, number theory, and combinatorics. With over 100 new pages, this updated and expanded edition now includes 30 activities and offers better solutions and teaching tips for all activities.

The book contains detailed plans for 30 hands-on, scalable origami activities. Each activity lists courses in which the activity might fit, includes handouts for classroom use, and provides notes for instructors on solutions, how the handouts can be used, and other pedagogical suggestions. The handouts are also available on the book’s CRC Press web page.

Reflecting feedback from teachers and students who have used the book, this classroom-tested text provides an easy and entertaining way for teachers to incorporate origami into a range of college and advanced high school math courses.

Visit the author’s website for more information.

Introduction

Activity 1 Folding Equilateral Triangles in a Square

Activity 2 Origami Trigonometry

Activity 3 Dividing a Length into Equal Nths: Fujimoto Approximation

Activity 4 Dividing a Length into Equal Nths Exactly

Activity 5 Origami Helix

Activity 6 Folding a Parabola

Activity 7 Can Origami Trisect an Angle?

Activity 8 Solving Cubic Equations

Activity 9 Lill’s Method

Activity 10 Folding Strips into Knots

Activity 11 Haga’s "Origamics"

Activity 12 Modular Star Ring

Activity 13 Folding a Butterfly Bomb

Activity 14 Molly’s Hexahedron

Activity 15 Business Card Modulars

Activity 16 Five Intersecting Tetrahedra

Activity 17 Making Origami Buckyballs

Activity 18 Making Origami Tori

Activity 19 Modular Menger Sponge

Activity 20 Folding and Coloring a Crane

Activity 21 Exploring Flat Vertex Folds

Activity 22 Impossible Crease Patterns

Activity 23 Folding a Square Twist

Activity 24 Counting Flat Folds

Activity 25 Self-Similar Wave

Activity 26 Matrix Model of Flat Vertex Folds

Activity 27 Matrix Model of 3D Vertex Folds

Activity 28 Origami and Homomorphisms

Activity 29 Rigid Folds 1: Gaussian Curvature

Activity 30 Rigid Folds 2: Spherical Trigonometry

Appendix: Which Activities Go with Which Courses

Bibliography

Index

### Biography

Thomas Hull

Praise for the First Edition:

For anyone who wants to enliven their class activities, this book gives wonderfully clear instructions for hands-on pager-folding activities, and specific suggestions as how to encourage students to ask questions, and to answer them, in the spirit of really ‘doing mathematics’ … I will use it next time I teach the Polya Enumeration Theorem.
Mathematical Reviews, February 2008

Is it possible to use origami in the higher level mathematics classroom? An affirmative answer is given by Thomas Hull’s book Project Origami: Activities for Exploring Mathematics. Based on Hull’s extensive experience of combining origami and mathematics teaching over the last fifteen years, it aims to help the teacher bring origami into the mathematics classroom, at the high school, college, and university level.
—Helena Verrill, AMS Notices, May 2007

Thomas Hull … is one of the country’s foremost researchers in origami mathematics—a subject making the slow transition from the ghetto of recreational math, where Sudoku and Rubik’s Cube dwell, to the rarified air of legitimate research topic … The fun part is watching the mash-up of intellectual analysis and paper creativity … but what really drives him, he says, is understanding what’s happening underneath each figure.
—David Brooks, Nashuatelegraph.com, May 2007

In his efforts to collect everything that he could find linking origami and math (and in his own research efforts), Hull has discovered not only the obvious links between origami and geometry but also intriguing intersections of origami with other fields of mathematics, such as algebra, number theory, and combinatorics.
—Ivars Peterson, Science News, June 2006

Overall, this book is an excellent resource for mathematics educators who would like to include some hands-on experimentation in their teaching.
—Steven Frankel, MAA Reviews, July 2006

This is probably the most comprehensive study of mathematical paperfolding produced in book form to date. … Along with theorems and formulas, there are copious notes for instructors, making the book more a teachers’ manual than a recreational pursuit. Even so it will reward a study even by those wishing solely to produce decorative forms.
—John Cunliffe, ELFA and British Origami Society

This book shows you how and explains how! … The book is neatly presented and is designed to work as a sourcebook for teachers wishing to use origami in the classroom, but is easily accessible to anyone.
—Dennis Walker, British Origami Society

Thomas Hull has written a truly wonderful book … Project Origami is full of surprises and depth. Hull is passionate about his work and it shines through in this text … Concrete connections to curriculum (upper high-school levels, undergraduate levels) are made clear, highlighting the relevance and importance of this material to mathematics education. Every teacher should take a hold of this book … Hull shares the joy of doing and exploring real mathematics and provides a route that all can pursue.
—James Tanton