2. Straight-Line Linkages and the Pantograph
2.1. Straight-Line Linkages
3. Protein Folding and Pop-Up Cards
4.1. Mountain and Valley Creases
4.2. Single-Vertex Flat Folds
4.3. The Maekawa-Justin Theorem
4.4. The Local Min Theorem
4.5. The Kawasaki-Justin Theorem
5.2. Fold and One-Cut Theorem
6. The Shopping Bag Theorem
6.1. Two Rigid Origami Examples
6.2. Dihedral Angle Constraints
6.3. The Shopping Bag Theorem
7. Diner's Problem: Edge Unfolding
7.1. Albrecht Dürer's Nets
7.5. Some Polyhedra with Nets
8. Unfolding Orthogonal Polyhedra
8.1. Orthogonal Polyhedra
9. Folding Polygons to Convex Polyhedra
9.2. Alexandrov's Theorem
9.3. Folding Convex Polygons
9.4. The Foldings of the Latin Cross
