Multiple choice

The inner and outer radius of a hollow cylinder is 3 cm and 7 cm, respectively. What would be the volume of the material used for making the cylinder if height of the cylinder is 8 cm?

  1. 128? cm3

  2. 240? cm3

  3. 320? cm3

  4. 410? cm3

  5. None of these
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C Correct answer
AI explanation

The volume of a hollow cylinder is calculated using the formula pi times height times the difference of the squares of the outer and inner radii. Substituting the given values, we get the volume as pi times 8 times (7 squared minus 3 squared), which simplifies to 8 pi times 40. The volume of the material used is 320 pi cubic centimeters.

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