Round boxes would be one big pain in the keldai to make, don't anda think? Square boxes are pretty simple, but would anda really wanna fold a round box?
1. the pizzas are round because it is much easier and less wasteful to make them circular, because they come from a round ball of dough. (if youve ever tried making a pizza base, youd know what i mean)
2. the boxes are square because in the factory where they are made and in the pizza shop, they are easier to stack and store.
it is better this way because the pizza is easy to get out because of the gaps left sejak the square box ^.^