For ∠BAC, sinθ 1= Perpendicular/ Hypotenuse = BC/AB.(Right Angle Triangle ABC) Concepts of Trigonometric Ratiosįixing the base and perpendicular can be difficult sometimes. Then, for ∠BAC, value of sinθ = Perpendicular/ hypotenuse = BC/AB Also, if we chose AC as the base and BC as the perpendicular. In that case, side AB will be the hypotenuse. The most common trigonometric ratios are sine, cosine, and tangent.Ĭonsider a right-angle triangle ABC, right-angled at C. Trigonometric ratios are the ratios of sides of a right-angle triangle. You can download Trigonometry Cheat Sheet by clicking on the download button belowīrowse more Topics under Introduction To Trigonometry Perpendicular: It is the side perpendicular to the base of the right-angled triangle.Moreover, any of the two sides other than the hypotenuse can be chosen as the base for performing the calculation. Base: The side on which the right angle triangle stands is known as its base.Also, it is opposite the right angle of the triangle. Hypotenuse: It is the largest side of the triangle.Furthermore, each side of the right angle triangle has a name. A right-angle triangle is a special triangle in which one angle is 90 o and the other two are less than 90 o. Trigonometric Ratios are applicable only for a right-angle triangle. Trigonometric Ratios in Right Angle Triangle

Trig ratios cheat sheet