I think you could get close by making a lot of pie slices, lining them up in a row, and then flipping every other one upside-down. Then you'd be able to put the

I think you could get close by making a lot of pie slices, lining them up in a row, and then flipping every other one upside-down. Then you'd be able to put them back together into a rectangle. The problem with our plan, I guess, is that you'd always be close at every pie slice size, never exactly there. These guys have figured out how to do it exactly, with a finite number of slices, instead of approaching it in the limit of infinity slices.