4MA1/2F Jun 2018, Question 21: Choosing the Right Trigonometric Ratio
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks
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The question, in short
Using a right-angled triangle with vertical side 12.6 cm and a 52° angle between that side and the hypotenuse x, calculate x to 3 significant figures.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1cos 52 = 12.6 / x
- 2x = 12.6 / cos 52
- 3x = 12.6 / 0.61566...
- 4x = 20.5
Answer20.5
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