4MA1/2HR Jun 2018, Question 8: Pythagoras' Theorem
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 3 marks
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The question, in short
Stanley walks 200 m east from A to B, then 160 m south from B to C. Work out the length of AC, giving the answer to 3 significant figures.
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Solution · 3 marks
- 1AB and BC are at right angles, so use Pythagoras
- 2AC² = 200² + 160² = 40000 + 25600 = 65600
- 3AC = √65600 = 256.12…, so 256 to 3 s.f.
Answer256
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