IGCSE Maths / Further trigonometry

Problem solving in three dimensions revision notes

Edexcel International GCSE Maths (4MA1), chapter 25: Further trigonometry, specification point 4.8f. Part of the full course.

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Three-dimensional trigonometry problems are solved by finding the right-angled triangle, drawing it flat, then using Pythagoras or SOH CAH TOA. This lets you work out lengths and angles involving lines through solids and the planes they meet.

More lessons in Further trigonometry

• The sine rule: finding a missing side
• The sine rule: finding a missing angle
• The ambiguous case of the sine rule
• The cosine rule: finding a missing side
• The cosine rule: finding a missing angle
• Choosing between the sine rule and the cosine rule
• Area of a triangle using half ab sin C
• Finding a side or an angle from a given area
• Area of a segment
• The angle between a line and a plane
• Trigonometry in pyramids and cones