O-LevelMathematicsMensuration4024/11 · May/June 2020 · Q243 Marks
[Curved surface area of a cone = πrl] The diagram shows a cone and a cylinder. The cone has radius 28 cm and slant height y cm. The cylinder has radius 15 cm and height 42 cm. The curved surface area of the cone and the cylinder are equal. Find the value of y.
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Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [3] 45
- [3] M2 for π× 28 × y = 2 × π× 15 × 42 oe
- [3] or M1 for π× 28 × y or 2 × π × 15 × 42
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