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That works too, thanks!

### paxwill says

I cannot take credit for this solution, it's something I remember from geometry class eons ago. If a rectangle has sides A and B, with A less than B, and B is no more than twice A, then it can be cut into three pieces that form a square when rearranged. The red and blue lines in the diagram indicate where to cut; they both have length equal to sqrt(A*B) and meet at a 90-degree angle.

Since a 16-by-9 rectangle meets the requirements (16 is less than 2*9 = 18), you can square it using this method.

I didn't know if anyone would come up with that solution. In case the rectangle doesn't have the right aspect ratio, you can always cut it into one that does, and then apply this method to square a rectangle.

### TrueAnimation says

Well technically without giving us restrictions on the number of cuts we can make then you could cut the cake up into 144 squares and simply rearrange them into a square.

A 3-cut solution is to:

Cut the bottom 4 squares off to make a 9 x 12 grid and a 9 x 4 grid.

Cut the 9 x 4 grid twice into three identical 3 x 4 grids.

Add the three 3 x 4 grid together to make a 3 x 12 grid and add next to the original 9 x 12 grid.

There must be a 2-cut solution there but it will most likely be with non-linear cuts.

That's a great solution. I didn't want to put any restrictions on the number of cuts and stifle creativity. Just curious to see people's thought processes.