# Exam Style Question

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Question id: 251. This question is similar to one that appeared in a GCSE Higher paper (specimen) for 2017. The use of a calculator is allowed.

### Pythagoras

Four copies of a green right-angled triangle are used to enclose a yellow square.

Find the area of the yellow square if the longest side of the green triangle is of length $$a$$ cm and the shortest side is $$b$$ cm.

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