Because all the buildings in the city are rectangular and their walls are parallel to the streets, we can define any building using only the coordinates of South-Western corner as two arguments (the length of the west to east walls, and the length of the north to south wall) along with the height of the building. These values are described as positive numbers using conventional units. The origin point of our coordinate system lies in the South-West , as a result the northern corner ends up having the greater coordinate value than the southern corner. To complete this mission we need to use a couple operations. See the class description below.