Enrich · Stage 5 · Trigonometry C (Path)

Enrich Rearrange the formula to deduce that cos⁡C = (a² + b² - c²)/(2ab) and use this to find an unknown angle

Extension and enrichment for students who are ready to go deeper: rich tasks, problem solving and open-ended challenges.

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  NRICH: Sine Problem
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.