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Maths question

Please could someone tell me what this type of question is called so I can find some guidance and similar practice questions.

Here are two straight lines, ABCDE and PQ

In the diagrams all the lengths are in cm.


Find an expression, in terms of x, for the length of DE

Give your answer in its simplest form.

I’m sorry I cannot show the diagram but hopefully someone could paste a link to similar types of questions and explanation.
Thank you

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