Geometry and measures - Mensuration and calculation: know and apply the sine rule a/sin A = b/sin B = c/sin C , and cosine rule a² = b² + c² – 2bc cos A, to find unknown lengths and angles (Higher tier only)(Pearson Edexcel GCSE)

Mastery Mind: Mathematics Revision · Oct 20, 2026 · 5m

When a triangle has no right angle, the sine and cosine rules turn unfamiliar diagrams into solvable calculations. Learn to choose the right rule, show mark-worthy working and handle obtuse angles, then test yourself with worked examples, original Edexcel-style questions and a ten-minute tutor podcast. Listen to this audio revision guide for Geometry and measures - Mensuration and calculation: know and apply the sine rule a/sin A = b/sin B = c/sin C , and cosine rule a² = b² + c² – 2bc cos A, to find unknown lengths and angles (Higher tier only). Test your knowledge with interactive exam…