Question

The slant height and base radius of a conical tomb are $25m$ and $24m$, respectively. Find the cost of whitewashing its curved surface at $Rs.12$ per $m^2.$

Answer 1

Given:-

Slant height of conical tomb, $l=25m$
Radius of conical tomb, $r=24m$

So,
Curved surface area of the conical tomb $=\pi rl$
$=\frac{22}{7}\times 14\times 25$
$=44\times 25$
$=1100m^2$

The cost of whitewashing per meter square is equal to $Rs.12.$

Hence, the cost of the whitewashing of $1100m^2$ is equal to $1100\times 12=Rs.13200$