Alain Rousseau's animations for hinged dissections from Dissections: Plane & Fancy

Alain Rousseau has used the Cabri Geometry II system to produce some wonderful animations of hinged dissections from my book. They include:

• Anton Hanegraaf's T-slide (converting a parallelogram to a trapezoid) - Fig 11.31
• Harry Lindgren's Q-slide (converting one quadrilateral to another) - Fig 3.13
• William Macaulay's quadrilateral to another quadrilateral - Figs. 11.10 and 11.11

They can be found by following this link.