Question

An electric geyser is cylindrical in shape, having a diameter of $35cm$ and height $12m$
Neglecting the thickness of its walls, calculate
(i) Its outer lateral surface area,
(ii) Its capacity

Answer 1

Lateral surface area = $2\pi rh=2\times \frac{22}{7}\times \frac{35}{2}\times 1200=132000c{m}^2$

Capacity=Volume=$\pi r^{2}h=\frac{22}{7}\times \frac{35}{2}\times \frac{35}{2}\times 1200=1155000c{m}^3$