The topic of Ruler has long-standing applications. You will be using rulers of different measurements for various purposes. You will be using them in mathematics for constructing diagrams, in other subjects for drawing figures. To measure the length of anything in practical life. It will also help you in understanding other measuring tools such as a protractor, set square, etc. Rulers will also help you get acquainted with various units of measuring distance. You need to practise a few times to get a grasp over its application.