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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

 

cos#1

 

 

Example #2

 

cosine #2

 

cos #2

 

 

Example #3

 

cosine problem #03

 

cos #3

 

 

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