GCSE · Congruence & similarity

Similar shapes & missing lengthsExam-style questions

Why equal angles force sides into a fixed ratio, finding the scale factor the right way round, similar triangles hidden inside one figure, and the area and volume scale factors k² and k³.

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25 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    Two triangles are similar. In the small triangle a side is 55 cm; the matching side in the large triangle is 1515 cm. Another side of the small triangle is 44 cm. Work out the matching side of the large triangle.
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