4MA1/1F Jan 2022, Question 24: Area of a Triangle
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks
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The question, in short
Isosceles triangle ABC has AB = AC = 17.5 cm and BC = 28 cm. Calculate its area.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 1The height from A cuts BC in half: 28 ÷ 2 = 14
- 2Height = √(17.5² − 14²) = √110.25 = 10.5
- 3Area = ½ × 28 × 10.5 = 147
Answer147
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