The curved surface area of a hollow cylinder is $4375 {\mathrm{cm}}^2$, it is cut along its height and formed a rectangular sheet of width $35 \mathrm{cm}$. Let the perimeter of the rectangular sheet be $k \mathrm{cm}$. Find the value of $k$. 

A company packages its milk powder in cylindrical container whose base has a diameter of $14 \mathrm{cm}$ and height $20 \mathrm{cm}$. Company places a label around the surface of the container (as shown in the figure). If the label is placed $2 \mathrm{cm}$ from top and bottom, let the area of the label be $k {\mathrm{cm}}^2$. Find the value of $k$.

The adjoining figure shows a metal pipe $77 \mathrm{cm}$ long. The inner diameter of cross section is $4 \mathrm{cm}$ and the outer one is $4.4 \mathrm{cm}$.

If its Inner curved surface area is $k {\mathrm{m}}^2$ then find $k$.

The adjoining figure shows a metal pipe $77 \mathrm{cm}$ long. The inner diameter of cross section is $4 \mathrm{cm}$ and the outer one is $4.4 \mathrm{cm}$.

If its outer curved surface area is $k {\mathrm{cm}}^2$ then find $k$.

The adjoining figure shows a metal pipe $77 \mathrm{cm}$ long. The inner diameter of cross-section is $4 \mathrm{cm}$ and the outer one is $4.4 \mathrm{cm}$. Let its total surface area be $k {\mathrm{cm}}^2$. Find the value of $k$.