Maths GCSE

Sine and Cosine rules.

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The Sine Rule

      a        =       b        =        c       

  SIN A         SIN B          SIN C

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The Cosine Rule

a    = b    + c    -  2bc COS A

OR

COS A = b   + c   - a    

                    2bc

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Area of a Triangle

If you know two sides and the angle between them you can find the area of the triangle using this formula:

Area of triangle = 1/2 ab SINC

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