4024/11 May/Jun 2020, Question 24: Composite Perimeter, Area and Volume
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
A cone of radius 28 cm and slant height y cm has the same curved surface area as a cylinder of radius 15 cm and height 42 cm. Find y.
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Solution · 3 marks
- 1Curved surface of cylinder = 2 × π × 15 × 42 = 1260π
- 2π × 28 × y = 1260π
- 328y = 1260
- 4y = 1260 ÷ 28 = 45
Answer45
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