You all are so helpful....Thank you for all the help I have gotten already. My ??? is why do the square rulers only have 2 sides of the actual square and the other 2 sides are different? For example a 3 1/2 X 3 1/2 has 2 sides that are 3 1/2 and 2 sides that are 3 inches...How do I get a total 3 1/2 inch square???? Thank you so much for your help again