The total surface area of a hollow metal cylinder open at both ends of external radius $8 cm$ and height $10 cm$ is $338 π cm 2$ . What is the thickness of metal in the cylinder?

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2 cm

3 cm

4 cm

5 cm

answer is B.

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Detailed Solution

Given- outer radius of the hollow metal cylinder = 8 cm.
Height of the hollow metal cylinder = 10 cm.
Total surface area =

338 π cm 2

.
Let r be the inner radius and R be the outer radius.
Question Image

Therefore, the thickness of metal in the cylinder is 3 cm.
Hence, option 2 is the correct option.

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