4MA1/2F Jan 2020, Question 20: Angles in a Triangle
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
A triangle has angles 30°, (4x + 10)° and (x + 20)°. Work out the value of x.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 130 + (4x + 10) + (x + 20) = 180
- 230 + 4x + 10 + x + 20 = 180
- 35x + 60 = 180
- 45x = 120
- 5x = 24
Answer24
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