There are two cylinders of radius \( \mathrm{R} \) and \( \mathrm{r} \) and having the same ...

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There are two cylinders of radius \( \mathrm{R} \) and \( \mathrm{r} \) and having the same height. Find the ratio of their lateral surface areas.
a. \( 2: 3 \)
b. \( \mathrm{H}: \mathrm{h} \)
c. \( \mathrm{R}: \mathrm{r} \)
d. None of these
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