If I need to provide the Linear Feet of my building's Plate Glass, I simply measure from Top to Bottom (ie Length), NOT from Side to Side (ie Width)...yes or no? Now that I have Linear Feet, that does not really give me the info needed to actually replace that Plate Glass, if some panels are 3ft wide and others 4ft, etc...yes or no? So, what is reason for determining Linear Feet instead of Square Feet??