4MA1/1HR Jan 2020, Question 15: Choosing the Right Trigonometric Ratio
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 4 marks
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The question, in short
Using the two right-angled triangles DEF and EFG in the diagram, calculate the length of side EG, giving the result to 3 significant figures.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 1In triangle DEF: EF = 12 × cos 40° = 9.192…
- 2In triangle EFG: tan 28° = EF ÷ EG
- 3EG = 9.192… ÷ tan 28° = 17.3
Answer17.3
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