### Lesson Details

**Name:**Cosine Rule 1**Code:**M.4.11.T2.6**Specification Reference:**G22**Keywords:**Angle, side, cosine, formula, substitute.**Objectives:**1. To learn the cosine rule in both forms. 2. To decide whether the cosine rule can be used in triangles. 3. To apply the cosine rule to find missing sides.**Competency:**To learn the cosine rule in both forms.**Proficiency:**To decide whether the cosine rule can be used in triangles.**Mastery:**To apply the cosine rule to find missing sides.

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