4024/11 May/Jun 2023, Question 21: Similar Triangles
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Two similar rectangles: ABCD has AB = 12 cm and BC = 9 cm, PQRS has PQ = 8 cm. Find the shaded area between them.
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Solution · 3 marks
- 1Scale factor = 8/12 = 2/3
- 2PS = 9 × 2/3 = 6 cm
- 3Shaded area = 12 × 9 − 8 × 6 = 108 − 48
- 4= 60 cm²
Answer60
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