A metal pipe is $77 \mathrm{c}\mathrm{m}$ long. The inner diameter of a cross section is $4 \mathrm{c}\mathrm{m}$, the outer diameter being $4.4 \mathrm{c}\mathrm{m}$. Find its Inner curved surface area. $\left(\mathrm{Use} \mathrm{\pi }=\frac{22}{7}\right)$

A metal pipe is $77 \mathrm{c}\mathrm{m}$ long. The inner diameter of a cross-section is $4 \mathrm{c}\mathrm{m}$, the outer diameter being $4.4 \mathrm{c}\mathrm{m}$. If its outer curved surface area is $k {\mathrm{cm}}^2$, find $k$. $\left(\mathrm{Use} \mathrm{\pi }=\frac{22}{7}\right)$

The diameter of a roller is $84 \mathrm{c}\mathrm{m}$ and its length is $120 \mathrm{c}\mathrm{m}$. It takes $500$ complete revolutions to move once over to level a playground. If the area of the playground is $k {\mathrm{m}}^2$, find $k$? $\left(\mathrm{Use} \pi =\frac{22}{7}\right)$

A cylindrical pillar is $50 \mathrm{c}\mathrm{m}$ in diameter and $3.5 \mathrm{m}$ in height. Find the cost of painting the curved surface of the pillar at the rate of $\mathrm{₹} 12.50$ per ${\mathrm{m}}^2$. [Use, $\pi =\frac{22}{7}$ and write only numerical value without rupee symbol]

Curved surface area of a right circular cylinder is $4.4 {\mathrm{m}}^2$. If the radius of the base of the cylinder is $0.7 \mathrm{m}$ and height is $k \mathrm{m}$, find $k$. $\left(\mathrm{Use} \pi =\frac{22}{7}\right)$

The inner diameter of a circular well is $3.5 \mathrm{m}.$ It is $10 \mathrm{m}$ deep. If the inner curved surface area of the well is $k {\mathrm{m}}^2$, then find the value of $k$. (Take $\mathrm{\pi }=\frac{22}{7}$)

The inner diameter of a circular well is $3.5 \mathrm{m}$. It is $10 \mathrm{m}$ deep. Find the cost of plastering this curved surface at the rate of $\mathrm{₹}\mathrm{}40$ per ${\mathrm{m}}^2$. [Use, $\pi =\frac{22}{7}$ and  write only numerical value without rupee symbol]

In a hot water heating system, there is a cylindrical pipe of length $28 \mathrm{m}$ and diameter $5 \mathrm{cm}.$ If the total surface area of radiating surface in the system is $k {\mathrm{m}}^2$, then find the value of $k$. (Assume $\mathrm{\pi }=\frac{22}{7}$)