A geometric dissection is a cutting of one or more figures into pieces that can be rearranged to form other figures. Some dissections have a very special property: The pieces can be connected by hinges, so that you can swing the pieces one way to form one figure, and another way to form the other figure. I identified a few such dissections in my first book on geometric dissections, and then I wrote a second book wholly on hinged dissections. You can find a number of animations of hinged dissections on the web:

- Two attached squares to one, and

Hexagons of areas 1, 12, and 13, from the webpages for my book. - Rick Mabry gets the triangle-to-square dissection to swing,
- Greek cross to a square, and an irregular triangle to a square, from Alain Rousseau's Cabri-powered webpages on dissections.

Maintained by
Greg Frederickson,

If you know of any dissection pages that I have missed,
please send me email.

*Last updated October 19, 2001.*