4MA1/2F Jun 2020, Question 23: Area of a Triangle
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 4 marks
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The question, in short
Find the area of an isosceles triangle with equal sides 8.5 cm and base 8 cm, using the diagram.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 1Split into two right-angled triangles: half the base = 4 cm
- 2Height² = 8.5² − 4² = 72.25 − 16 = 56.25
- 3Height = √56.25 = 7.5 cm
- 4Area = ½ × 8 × 7.5 = 30
Answer30
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