Square boxes are easier to make, ship and store flat. Round boxes typically have to be pre-made and are еще bulky to transport.
Circular пицца is easier to cut into slices. Also, if the пицца were square, it would look weird.
If a round пицца came in a round box and fit perfectly how would we get a slice out without struggling или making a total mess...we need the edges of empty Космос to be able to get at the pizza.
Is it possible to make a round box that is hinged and locks? If it is I am pretty sure it would be expensive rather a square box is not only еще common but it is cheap as well