Question:
The lateral surface area of a cylinder is
(a) $\pi r^{2} h$
(b) $\pi r h$
(c) $2 \pi \mathrm{rh}$
(d) $2 \pi r^{2}$
Solution:
(c) $2 \pi r h$
The lateral surface area of a cylinder is equal to its curved surface area.
$\therefore$ Lateral surface area of a cylinder $=2 \pi r h$