Question

Radius of a hemisphere is $4.5cm$. Find its total surface area and volume.

Answer 1

Given,Radius of hemisphere (r) $=4.5cm$
Surface area of hemisphere $=3\pi r^2$
Let
$\begin{array}{c}=3\times \frac{22}{7}\times (4.5{)}^2\\ =\frac{2\times 22\times 4.5\times 4.5}{7}\\ =190.93{cm}^2\end{array}$
Volume of hemisphere $=\frac{2}{3}\pi r^3$
$\begin{array}{c}=\frac{2}{3}\times \frac{22}{7}\times (4.5{)}^3\\ =\frac{2\times 22\times 4.5\times 4.5\times 4.5}{3\times 7}\end{array}$
$\begin{array}{c}=\frac{1336.5}{7}\\ =190.93{cm}^3\end{array}$
Hence, total surface area $=190.93{cm}^2$ and volume $=190.93{cm}^3$