Trigonometry: Cosine Rule - Finding a Length
In this tutorial I show you how to find a length of a side of a non right-angled triangle by using the Cosine Rule.
You can do this if you are given the opposite angle and the two other sides.
In this series : Sine Rule (finding a side) | Sine Rule (finding an an angle) | Cosine Rule (finding an angle)
Related topic : Trigonometry for right-angled triangles
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