Paper Folding | |

Warm Up Activities | |

Introduction | |

Folding Polygons from a Circle | |

Making Squares | |

Two Congruent Halves | |

Dissecting Figures | |

Polygons and the Angle Relationships | |

Introduction | |

Parallel Line Grid - Triangle Angle Sum | |

Envelope Fold - Triangle Angle Sum | |

Triangle and Quadrilateral Angle Sums by Tearing | |

Polygon Angle Sums: How many Triangles? | |

The Angles of a Polygon | |

When Does Erika's Idea Work? | |

The Greedy Triangle | |

Problems: Angle Sums and Angle Relationships | |

Four Kinds of Related Angles | |

Figuring Angles and Checking by Measurement | |

Parallel Lines: How to Recognize Them | |

Measuring Sides and Angles of Triangles | |

Convex: Different Ways to Make Sense of It | |

Angle Problems - Version A | |

Angle Problems - Version B | |

Angle Probems - More | |

How Do I Know if I Understand? | |

Conjecturing ABout Quadrilaterals | |

Possible or Not? | |

True or False (with Example) | |

Under What Conditions? | |

Quadrilaterals and Their Definitions | |

Introduction | |

Checking Properties of Quadrilaterals | |

Properties of Quadrilaterals | |

Marking Quadrilateral Properties | |

Properties of Diagonals of Quadrilaterals | |

Checking Quadrilaterals by Folding | |

Read Carefully: Every Word Counts! | |

Checking Examples Visually or Physically | |

Exploring Medial Quadrilaterals | |

Problems: Properties of Quadrilaterals, Version A | |

Problems: Properties of Quadrilaterals, Version B | |

More Problems: Properties of Quadrilaterals | |

A Deeper Understanding of Definitions | |

Special Cases of Quadrilaterals | |

Definitions: Inclusive or Exclusive | |

Problems: Inclusive and Exclusive Definitions | |

What Is a Kite? Equivalent Definitions | |

Problems: Definitions of Quadrilaterals, Version A | |

Problems: Definitions of Quadrilaterals, Version B | |

More Problems: Definitions of Quadrilaterals | |

How Do I Know if I Understand? Prologue: Four Contexts for Geometric Constructions Prologue to Chapters 3, 10, 12, and 14 | |

Constructions by Paper Folding | |

Introduction | |

Introducing CDs: Two Basic Constructions | |

CD Problem: A Parallel Line | |

CD Problem: The Median | |

CD Problem: An Equilateral Triangle | |

CD Problem: A Square | |

Circumscribing Circle | |

Inscribed Circle | |

Balance Point of a Triangle | |

Additional CD Problems Using Basic Construction Steps | |

Group Problem: Inscribed Circles | |

Folding a Six-Pointed Star or a "Snowflake" | |

Problems Involving Paper Folding | |

How Do I Know if I Understand? | |

Explorations in Three-dimensional Geometry | |

Introduction | |

Polyhedra (Solids) from an Envelope | |

Roll-and-Fold Prism and Pyramid Activities | |

Net Project A: Prisms | |

Prisms | |

Makiing Sense of Volume: A Basic Relationship | |

Net Project B: Pyramids | |

Pyramids | |

Edges, Faces, and Vertices of Polyhedra | |

Special Kinds of Polyhedra | |

Riddles with Solids | |

Volumes Prisms, Pyramids, and Spheres | |

Volume of a Pyramid | |

What Does Volume Really Mean? | |

Volume of Solids: First Try | |

Solid-Geometry Problems, Version A | |

Solid-Geometry Problems, Version B | |

More Solid-Geometry Problems Addendum: Unit Origami: An Introduction | |

Instructions for the Basic Parallelogram Unit | |

Project for the Whole Class: Monster Stellated Icosahedron | |

Uni | |

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