Step the Square
Divide the 12x12 square on the left into two
pieces so that to rearrange them into the 9x16 the rectangle on the
You can draw the square using a square grid as
shown in the illustration, or simply download the
PDF version for printing.
More comprehensive research on this and similar
dissection puzzles can be found in the
Dissections: Plane & Fancy book by Greg Frederickson.