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IGCSE Mathematics: Cosine Rule

  • Updated August 3, 2023
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IGCSE Mathematics: Cosine Rule

Cosine Rule

The cosine is just like the sine rule, but it’s for when you know 3 sides and want to find an angle OR when you know 2 sides + 1 angle (none are opposite each other meaning no sine rule) and need to find the remaining side.

The cosine rule to find a side is just:

And the cosine for to find an angle is just:

Remember for this one you’ve only worked out the Cosine of the angle! You still need to use cos-1() to find C!

Cite this paper

IGCSE Mathematics: Cosine Rule. (2023, Aug 02). Retrieved from https://samploon.com/igcse-mathematics-cosine-rule/

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