Question

A vessel in the form of a hollow hemisphere mounted by a hollow cylinder. The diameter of the hemisphere is $14cm$ and the height of cylindrical part is $13cm$. Find the inner surface area of the vessel.

Answer 1

Inner surface area of vessel $=$ CSA of hemisphere + CSA of cylinder

$=2\pi r^2+2\pi rh=2\pi r(r+h)$

$=2\times \frac{22}{7}\times 7(7+13)=44\times 20=880{cm}^2$