The slant height and base diameter of a conical tomb are $25 \mathrm{m}$ and $14 \mathrm{m}$ respectively. Find the cost of whitewashing its curved surface at the rate of $\mathrm{₹}210$ per $100 {\mathrm{m}}^2$. $\left(\mathrm{Use} \mathrm{\pi }=\frac{22}{7}\right)$

A joker’s cap is in the form of a right circular cone of base radius $7 \mathrm{c}\mathrm{m}$ and height $24 \mathrm{c}\mathrm{m}.$ If the area of the sheet required to make $10$ such caps is $k {\mathrm{cm}}^2$, find $k$. $\left(\mathrm{Use} \mathrm{\pi }=\frac{22}{7}\right)$

 If the surface area of a sphere whose radius is $10.5 \mathrm{c}\mathrm{m}$ is $A {\mathrm{cm}}^2$, then find the value of $A.$ (Use $\mathrm{\pi }=\frac{22}{7}$)

Take, $\mathrm{\pi }=\frac{22}{7}$.
The surface area of a sphere of radius $5.6 \mathrm{c}\mathrm{m}$, is $k {\mathrm{cm}}^2$, then find $k$ (Write in decimal form)

If the surface area of a sphere of diameter $14 \mathrm{c}\mathrm{m}$ is $k {\mathrm{cm}}^2$, then find the value of $k$. Use $\mathrm{\pi }=\frac{22}{7}$

Assume $\mathrm{\pi }=\frac{22}{7}$.  The diameter of a sphere is $21 \mathrm{c}\mathrm{m}$. If the surface area of the sphere is $k {\mathrm{cm}}^2$, then write the value of $k$ as final answer.

If the surface area of a sphere of diameter $3.5 \mathrm{cm}$ is $k {\mathrm{cm}}^2$, then write the value of $k$ as final answer. ($\mathrm{\pi }=\frac{22}{7}$) Give the answer in one decimal point.