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.
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.

Learn how to use the Pythagoras Theorem and other identities to simplify and calculate trigonometric functions such as sine, cosine and tangent. See examples, diagrams and formulas for right triangles, cosecants, secants, cotangents and more.

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    • sin cos tan rules