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Cosine Rule

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Examples, videos, and solutions to help GCSE Maths students learn how to use the cosine rule to find either a missing side or a missing angle of a triangle.

The following diagram shows the Cosine Rule that can be used to find a missing angle or a missing side of a triangle. Scroll down the page for more examples and solutions.

Cosine Rule

GCSE Maths the Cosine Rule
The Cosine Rule and how to use it in GCSE maths.
This video shows how to use the Cosine rule to find either a missing side or a missing angle.

Cosine rule
This question is on the cosine rule.

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You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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