Hinged Dissection of a Generalized Greek Cross to a Square
To get a generalized Greek cross, take a square and cut off four small squares from the corners. This Demonstration shows a hinged dissection of a square to a generalized Greek cross , where is the ratio of the length of the side of the cross to the side of the resulting square.
 G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge University Press, 1997 p. 125.
"Hinged Dissection of a Generalized Greek Cross to a Square"
Wolfram Demonstrations Project
Published: December 4 2013