M-GEO-052Higher onlyReview: Pending

Use the cosine rule

Geometry and measures · Trigonometry (T-GEO-021)

v1 mapping, pending teacher review. Only AQA and Edexcel are mapped so far. The first 3 pilot worksheets and their worked answers are available; remaining worksheets are coming soon. All videos are still coming soon.

Retrieval: Substitution and inverse cosine
Fluency: Find sides and angles
Reasoning: Explain the ratio or rule using the known information.
Application: Find a distance from two lengths and an included angle
Common misconception: Opposite and adjacent depend on the chosen reference angle.

Video brief

Model how to use the cosine rule. Explain each step; pause for a matching shadow question.

Planned video: V-GEO-052 · Video coming soon

Worksheets

Worksheets coming soon

Note: Scope and tier apply to this skill; tag each generated variant separately.