Maths Trigonometry

Trig

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Formulas

  • sin = opposite / hypotenuse
  • cos = adjacent / hypotenuse
  • tan = opposite / adjacent
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Sine rule

  • For non right angled triangles
  • We can use the sine rule to find the size of an angle or length of a side.

    The sine rule is:

    sinA over a = sinB over b = sinC over c (http://www.bbc.co.uk/schools/gcsebitesize/maths/images/furthertrigonometryhirev2_1.png)

    or

    a over sinA = b over sinB = c over sinC (http://www.bbc.co.uk/schools/gcsebitesize/maths/images/furthertrigonometryhirev2.png)

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