4MA1/2F Jun 2020, Question 22: 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 3.4 cm and horizontal side 4.7 cm, calculate the angle x opposite the 3.4 cm side, giving the answer to one decimal place.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 13.4 is opposite x and 4.7 is adjacent, so use tan
- 2tan x = 3.4 ÷ 4.7
- 3x = tan⁻¹(3.4 ÷ 4.7) = 35.88… = 35.9
Answer35.9
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