In the series of our posts after our last post titled How to prepare for 10th boards, 12th boards, IIT and NEET Exams We at Alchemy Learning bring you a very basic but valuable concept which can bring a change in the way you prepare for your exams Trigonometric ratios are defined as the ratios of sides of a right angle triangle till class 10 th but trigonometric ratios are not constrained to a right angle triangle. In earlier classes tan π is defined as the ratio of perpendicular to base in a right angle triangle and tan90 o is written as β in trigonometric tables. We see in trigonometric table there is one value of tan π written as βNOT DEFINEDβ. But we never ask ourselves WHY? Considering π = 0 o Let us consider a right angle triangle ABC which has right angle (90 o ) at B and consider angle A = π , AC = hypotenuse, BC = perpendicular and AB = base. When we consider values of π to be 30 o , 45 o and 6...