Relevance of Ruler remains unquestionable. If you are someone who is having access to education you are bound to come across rulers at various points during years of schooling. You will be using a ruler at many places - in maths, for drawing figures in chemistry, physics, biology, etc. Even for constructing advanced level constructions in geometry, you will be needing rulers. You will be using longer rulers in higher standards when you will study civil engineering or architecture. You should practice this and other topics in geometry thoroughly to prepare for future studies as well as for the upcoming exams.