In Puzzle 22.1, I asked for an 8-piece twist-hinged dissection of two unequal squares to one. However, whenever the smaller square has sidelength less than 3/4 of the larger, then there is a 6-piece twist-hinged dissection, as we see below. The technique is a variation of what I use for a number of other twist-hinged dissections. (See A wide variety of twist-hinged dissections.)
Copyright 2006, Greg N. Frederickson.
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Last updated January 4, 2006.