Learn how to use sine, cosine and tangent functions to find angles and distances in right-angled triangles and other triangles. See examples, graphs, calculators and links to more topics on trigonometry. Trigonometric relationships are very important in the construction and planning industry and allow precise calculation of unknown lengths and angles. Part of Maths Numeracy (WJEC) Geometry and Learn the sine, cosine and tangent ratios of sides of a right triangle and how to identify the opposite, adjacent and hypotenuse sides using SOHCAHTOA. See examples, practice problems and a video lesson on the sine ratio. Sine, cosine and tangent are the primary trigonometry functions whereas cotangent, secant and cosecant are the other three functions. The trigonometric identities are based on all the six trig functions. Check Trigonometry Formulas to get formulas related to trigonometry. Table of Contents: Definition List of Trig Functions Reciprocal Identities Learn how to calculate sine, cosine and tangent of any angle using the formula soh s ine = o pposite / h ypotenuse, soh cah c os = a djacent / h ypotenuse, soh toa t an = o pposite / a djacent. See examples, practice questions and a memory trick for sohcahtoa. FXiV97.

sin cos tan rules