Mathematics · Mensuration
An advanced materials research laboratory is fabricating a thin cylindrical shell with an outer radius of 21 cm, an inner radius of 19 cm, and a height of 25 cm. What is the ratio of the magnitude of the volume of material used to the total curved surface area (including both the inner and outer surfaces) of the shell?
- 13 : 4
- 21 : 2✓
- 32 : 3
- 41 : 1
Correct answer
1 : 2
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