IGCSE Maths / Introducing trigonometry

Combining Pythagoras and trigonometry revision notes

Edexcel International GCSE Maths (4MA1), chapter 16: Introducing trigonometry, specification point 4.8c-f. Part of the full course.

Watch the video lesson · IGCSE Maths past papers

Pythagoras and SOH CAH TOA can be used one after the other in the same right-angled triangle. Decide which tool each step needs, then check that you have answered the full question.

More lessons in Introducing trigonometry

• The sine ratio
• The cosine ratio
• The tangent ratio
• Labelling sides and choosing the trig ratio
• Finding a missing side with trigonometry
• Missing side when the unknown is in the denominator
• Finding a missing angle with inverse trig
• Two-step right-angled triangle problems
• Right-angled trigonometry with bearings
• Angles of elevation and depression