Traditionally you make pizza flat by rotating the dough, so it assume a round shape. It is much easier to cut a piece of box to have a square shape that it to have a round one.
You can’t actually stack circular boxes side by side any more efficiently than you can square boxes whose side is the same length as the diameter of the circle — circles take up the same total space but don’t use all of it! Since squares are easier to make, you may as well stick with them…
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