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Brainlag Learn / GCSE Maths

Pythagoras and trigonometry

Pythagoras' theorem, sin, cos and tan in right-angled triangles, angles of elevation, depression and bearings, exact values, 3D problems, and the sine and cosine rules.

Lessons

  1. Pythagoras' theoremFind the hypotenuse or a shorter side of a right-angled triangle, check whether a triangle has a right angle, and find the distance between two points. 25 min, free
  2. Sin, cos and tan for sidesLabel the opposite, adjacent and hypotenuse from an angle, choose sin, cos or tan, and find a missing side. 25 min, with the Unit Circle, free
  3. Finding angles, elevation and bearingsFind an angle with sin⁻¹, cos⁻¹ or tan⁻¹, and use trigonometry for angles of elevation and depression and for bearings. 25 min, with the Scientific Calculator, Plus
  4. Exact values and 3DExact values of sin, cos and tan of 0°, 30°, 45°, 60° and 90° from two special triangles, then Pythagoras and trigonometry in cuboids and pyramids (Higher). 25 min, with the Unit Circle, Plus
  5. The sine and cosine rulesThe sine rule, the cosine rule and area = ½ab sin C for triangles without a right angle, and how to choose between them. 25 min, Plus, Higher tier

Practise and test

AQA, Pearson Edexcel and OCR are registered trade marks of their owners. Brainlag Learn is independent: it is not affiliated with or endorsed by any exam board, and every question on it is original.