Question

Find the curved surface of a right-circular cylinder whose height is $13dm$ and diameter of the base is $5dm$.

Answer 1

$Radius=\frac{Diameter}{2}=\frac{5}{2}=2.5dm=25cm$

$Height=21dm=210cm$

$\therefore$ Curved surface area $=2\pi rh=2\times \pi \times 25\times 210=(2\times \frac{22}{7}\times 25\times 210)c{m}^2=33000c{m}^2$