Dissection of a Latin Cross into a Square
This Demonstration shows a dissection of a Latin cross into a square. Moving the "move" slider from right to left dissects either a Latin cross or a square (depending on what is selected in the first control) into a common rectangle. Hence, either can be dissected into the other.
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 144. www.cs.purdue.edu/homes/gnf/book.html.