✔ 最佳答案
It's easier for the person to carry pizzas to deliver a squared box than a round box when stacking them. It also gives more space to eat the pizza or grab one. It's not true that it's cheaper to manufacture a square box, a round one would save more raw materials, the only thing is that they would need to buy the mold/machines to make them initially. A round box for round pizza in the shape of a circle would not work because it would be harder to open and you couldn't lift easily, however, it if was in the shape of a hexagon or octagon, it would be more feasible because it would have a rectangular barrier to lift and close it back easily with it being completely removed. A square is also more convenient because of the size/amount of pizza.