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Edexcel IGCSE Math A Foundation 5.2.J enlargement scale factor

Edexcel IGCSE Math A Foundation 5.2.J enlargement scale factor
Edexcel IGCSE Math A syllabusMath A 4MA1First assessment 2018

Practise the enlargement-scale question by comparing corresponding side lengths on the object and image before writing the scale factor.

How this is tested

  • Find the scale factor of an enlargement by comparing corresponding side lengths.

Question 15(a)

[Maximum number: 1]
Diagram NOT accurately drawn

Diagram NOT accurately drawn

Triangle DEF is an enlargement, centre O, of triangle ABC.

AB=4 cmDE=12 cmBC=5 cmOB=7 cm\begin{aligned} & A B=4 \mathrm{~cm} \\ & D E=12 \mathrm{~cm} \\ & B C=5 \mathrm{~cm} \\ & O B=7 \mathrm{~cm} \end{aligned}

Write down the scale factor of the enlargement.