Discussion
For that same truncated cylinder, the mean generator length is
Answer: D
Correct answer: 80 mm
\[ \frac{60 + 100}{2} = 80\ \mathrm{mm}. \] The generators vary linearly round the cylinder for a plane oblique cut, so the mean is the average of the extremes - and the lateral area is that mean multiplied by the circumference, exactly as for an uncut cylinder of 80 mm height.
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