Maths GCSE

      a        =       b        =        c       

  SIN A         SIN B          SIN C

a    = b    + c    -  2bc COS A

OR

COS A = b   + c   - a    

                    2bc

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