4MA1/1F Jun 2022, Question 15: Composite Perimeter, Area and Volume
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 4 marks
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The question, in short
Find the perimeter of shape ABCDEFG made from square ABDF and three identical isosceles triangles, given the square's perimeter is 48 cm and each triangle's perimeter is 30 cm.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 1Side of the square = 48 ÷ 4 = 12 cm
- 2Each triangle's two equal sides add to 30 − 12 = 18 cm
- 3The outline is side AB plus the two equal sides of each of the 3 triangles
- 4Perimeter = 12 + 3 × 18 = 66
Answer66
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