Trigonometry

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  • Created by: Ian
  • Created on: 01-05-08 18:43

Non-Right-angled Triangles

For any triangle:

Area = 1/2(abSinC)

Sine Rule

(SinA/a) = (SinB/b) = (SinC/c) --- to work out the angle, will rearrange to:
A = Sin-1(aSinB/b) and for the side length:
a = (SinAb/SinB)
Note it will work with C and c as well as B and b
The Sine Rule requires at least one pair of angle and triangle!

Cosine Rule

CosA = (a^2 x b^2 - 2acCosB)/2a
to re-arrange, swap the letters around...

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