$1 \, m^{2} = \ldots \ldots \, cm^{2}$

$A$ conical tent with radius $7\, m$ and slant height $12\, m$ is to be made. How many metres of $2\, m$ wide tarpaulin will be required? If the price of tarpaulin is ₹ $48$ per meter,find the cost of the tarpaulin.

$A$ cuboidal box measures $25 \, cm \times 15 \, cm \times 8 \, cm$. Find its total surface area (in $cm^2$).

Find the amount of water displaced by a solid spherical ball of diameter $4.2 \, cm$,when it is completely immersed in water. (in $, cm^3$)

Find the volume of a sphere with radius $2.1 \, m$ (in $m^{3}$).

The surface area of a sphere is $5544 \, cm^2$. Find its volume in $cm^3$.