Numeracy Intermediate June 2023 Unit 2 Q10
10. Delta Metals makes aluminium chimneys in the shape of open cylinders.
Each chimney has a height of 2·5 m.
The external diameter of each chimney is 0·18 m.
Calculate the external curved surface area of one of these chimneys.
Give your answer correct to 3 significant figures. [4]
| Scheme | Marks | Comments |
|---|---|---|
| (Surface area) π × 0.18 × 2.5 or equivalent | M2 | Accept equivalents in cm throughout Must be the complete method M1 for any one of the following provided it is not embedded in further incorrect working:
|
| 1.41 (m\(^{2}\)) or 14100 cm\(^{2}\) | A2 | Mark final answer. Must be correct to 3 significant figures. A1 for any one of the following:
|