Home >> PURE MATHS, Trigonometry, sine & cosine rules
The Sine Rule |
The Sine Rule
Use any pair of equalities.
In the triangle you are given 3 quantities and required to work out the 4 th.
Manipulating the Ratio
Take two ratios, cross multiply and rearrange to put the required quantity as the subject of the equation.
Example #1
Example #2
Example #3
The Cosine Rule
There are two problem types:
You are given 2 sides + an included angle and required to work out the remaining side.
You are given all the sides and required to work out the angle.
Example #1
Example #2
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