What specific type of triangle is required to use Pythagoras' theorem?
Right-angled triangles (containing a 90° angle).
Flashcards for Edexcel GCSE Maths Pythagoras, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 21 cards, matched to the Edexcel GCSE Maths (1MA1) specification.