Topic explanation
Similar Triangles is part of the Geometry & Measures strand in GCSE Maths. Use scale factors with lengths, areas and volumes in similarity problems.
Exam papers from AQA, Edexcel, OCR assess fluency (short questions) and reasoning (multi-mark). Practise reading command words ("show that", "hence", "give your answer in the form...") before you rearrange algebra or interpret a result.
Key formulas & rules
- Pythagoras: a² + b² = c² (right-angled triangles)
- SOHCAHTOA for right-angled trig; sine/cosine rules for non-right triangles
- Circle: circumference 2πr; area πr²; volume formulas for prisms, cylinders, cones, spheres
Common mistakes
- Arithmetic and sign errors when simplifying expressions involving similar triangles.
- Not answering in the required form (fraction vs decimal, surd vs rounded).
- Missing a final sentence that interprets the result in context when the question is applied.
Exam tips
- Underline key words in the question: "exact", "integer", "give reasons".
- Estimate or use inverse operations to sanity-check answers when a calculator is allowed.
- Use StudyVector practice filtered to "Congruence & Similarity" to drill exam-style questions on this skill.
Practice questions
Exam-style questions aligned to your board. Open full practice for worked feedback and your next best question.
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