Question

The inner diameter of a circular well is$3.5m$. It is $10m$deep. Find its inner curved surface area.

Answer 1

As we know the well is a cylindrical shape

$Diameter=\frac{Radius}{2}=\frac{3.5}{2}$

Its inner curved surface area $\begin{array}{rcl}& =& 2\pi rh\end{array}$

$\begin{array}{rcl}& =& 2\times \frac{22}{7}\times \frac{3.5}{2}\times 10\\ & =& 110m^2\end{array}$

Hence, inner curved surface area of well is $110m^2$.