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Coursework Notes - Shape & Space


Cosine Ratio


The Cosine Ratio


cosine ratio



Method for problems:


  1. write out the ratio putting in the values for the given sides and/or angle.
  2. put a '1' under the sine/cos/tan
  3. cross multiply(top left by bottom right = top right by bottom left)
  4. make the 'unknown' the subject of the equation




Example #1


cosine #1





Example #2


cosine #2


cos #2



Example #3


cosine problem #03


cos #3



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