4MA1/2HR Jan 2020, Question 20: Area Factor of Similar Shapes
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2HR (Higher) · Calculator · 4 marks
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The question, in short
Two similar vases have heights 9 cm and 13 cm. Their combined surface areas total 1800 cm². Work out the surface area of the smaller vase.
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Solution · 4 marks
- 1Area scale factor from A to B = 13² ÷ 9² = 169/81
- 2A + (169/81)A = 1800
- 3(250/81)A = 1800
- 4A = 1800 × 81 ÷ 250 = 583.2, so 583
Answer583
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