Do you know why A4 paper is known as ‘A4’ ?
Today in Europe and Asia the popular paper sizes are ‘A’ series.The ratio of length and breadth(l/b=√2) in this series is √2. The ratio of √2 in paper size was first noted in 1786 by the German Scientist and Philosopher , George Christoph Lichtenberg. There are 11 sizes of paper in ‘A’ series(A0 to A10). …