Paper 2 · Trigonometry
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Lesson 1 of 8
Trigonometry 1.1 – Pythagoras theorem
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- Find the third side of a right-angled triangle using Pythagoras a² + b² = c²
- Identify the hypotenuse as the side opposite the right angle — always labelled c
- Solve Pythagoras with algebraic sides: expand, factorise, and reject negative-length roots
- Recognise the Pythagorean triples (3, 4, 5), (5, 12, 13) and (9, 40, 41) on sight
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