"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**

- Study introductory trigonometryMathsisfun.com has written a good introductory lesson on trigonometry, which includes definitions, graphics and manipulatives. You don't need to read the whole page - only up to "Unit Circles".
- Read about the sine ratioRead about how to find and use sines at teacherschoice.com.au.
- Read about the cosine ratioRead about how to find and use cosines at teacherschoice.com.au.
- Read about the tangent ratioRead about how to find and use tangents at teacherschoice.com.au.
- Download an intro to trig worksheetThis downloadable worksheet from mathworksheetsgo.com contains sample problems, problem sets and all answers. It covers the identification of adjacent sides, opposite sides and hypotenuse as well as the calculation of sine, cosine and tangent.
- Quiz yourself on calculating sine, cosine and tangentUse this six-question quiz from onlinemathlearning.com for a quick online check of your trig knowledge.

Use these search terms to find your own resources:

*trigonometry ratiosintroduction to trigonometrydefinition of sinedefinition of cosinedefinition of tangentsohcahtoa*

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