Edexcel IGCSE Math A 4.11.A lengths in similar shapes

Practise similar-length questions by matching corresponding sides, finding the linear scale factor and applying it to the missing length.

Exam points

Match corresponding sides in similar quadrilaterals, triangles or other shapes.
Find and use the linear scale factor to calculate a missing side length.
Work with algebraic or numerical similar-shape diagrams to find x, y or a length.

[Maximum number: 2]

4 A B C and DEF are similar triangles.

Diagram NOT accurately drawn

Work out the length of DE. cm

The area of triangle DEF is $525 \mathrm{~cm}^{2}$

$40\div16\times12=30$

Final answer:
30

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