dis includes mathematical explanation focusing on the work area...if we back on the basic equation/understanding for the square its the square of the given number....and we also look for the area of a circle which pie(sq. dia/4)....if take a look of it diameter of a circle has a relation with the base and height of a square,,so i conclude that packaging a round object with square box has more efficient than other shape coz of the work area due to the space at the perimeter of a round pizza...=)