GCSE Maths: 3D Trigonometry & Pythagoras
Use Pythagoras and SOHCAHTOA inside 3D solids by finding a right-angled triangle to work in. Practise it with adaptive questions for AQA, Edexcel, OCR and Eduqas.
What you need to know
The concepts examiners test on 3d trigonometry & pythagoras, and what each one is really asking.
Where marks get lost
The exam technique that separates a correct method from a correct answer.
- Trying to work in the 3D diagram instead of redrawing the triangle flat
- Rounding the base diagonal before using it in the second step
- Using an edge of the solid as the hypotenuse when the diagonal is longer
- Measuring the angle to the wrong line — it is to the shadow on the plane, not to an edge
3D Trigonometry & Pythagoras questions students ask
Is 3D Trigonometry & Pythagoras on the Foundation paper?
Yes. 3D Trigonometry & Pythagoras appears at both Foundation and Higher tier, though Higher papers take it further.
What should I know before starting 3D Trigonometry & Pythagoras?
It builds on Pythagoras and Trigonometry and Properties of 3D Shapes. If those feel shaky, practise them first — 3D Trigonometry & Pythagoras questions assume them.
What is the most common mistake in 3D Trigonometry & Pythagoras?
Trying to work in the 3D diagram instead of redrawing the triangle flat.
Which exam boards cover 3D Trigonometry & Pythagoras?
All four we support — AQA, Edexcel, OCR and Eduqas. GCSE Maths subject content is set by the DfE, so the topic is common to every board; what changes is the paper structure and the grade boundaries.