This key facts covers Key Facts within 3D Trigonometry for GCSE Mathematics. Revise 3D Trigonometry in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 2 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 5 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 5
Practice
12 questions
Recall
2 flashcards
Key Facts
| Key Concept | What to Do |
|---|---|
| Space diagonal | Use Pythagoras twice: first on base, then on vertical triangle |
| Angle with base | Draw triangle with: height = opposite, base diagonal = adjacent |
| 3D Pythagoras | d² = x² + y² + z² (for space diagonal) |