Enrich · Stage 5 · Trigonometry D (Path)

Enrich Verify and use the relationships between the sine and cosine ratios of complementary angles in right-angled triangles: sin⁡A = cos⁡(90° - A) and cos⁡A = sin⁡(90° - A)

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  NRICH: Round and Round and Round
  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.