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DIY Maths: Introduction to sine, cosine and tangent


In this module, you can study how to calculate sine, cosine and tangent for the angles of a right triangle; how to use SohCahToa to remember the formulae for calculating sine, cosine and tangent.


Did you know?

"Adjacent" and "opposite" sides can change, depending on which angle you start from.

"Cos(x)" means "the cosine of x degrees"; it does NOT mean multiply the cosine by x.

Study and practice

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Use these search terms to find your own resources:

trigonometry ratios
introduction to trigonometry
definition of sine
definition of cosine
definition of tangent

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