Trigonometry

More trigonometry rules


There are just a few more basic rules of trigonometry to learn.

If we have any triangle (this time not a right angled triangle) ...


Then the sine rule is:

The cosine rule is:


The area of the triangle is:



These are rules to simply learn - the key thing in trigonometry is being able to use these rules.

In trigonometry you will be faced with certain known values and an unknown value. All you have to do is calculate the unknown value using these formulae & the known values.