The area of a rectangle of breadth $18 \mathrm{cm}$ is $360 {\mathrm{cm}}^2$.Find its perimeter.

Shreya is doing a paper-cutting activity. She cuts out the four corners of a rectangular sheet as shown in the figure. If the area of the sheet is $k {\mathrm{cm}}^2$ then,  find the value of $k$.

The floor of a hotel room has dimensions $5.5 \mathrm{m}\times 4 \mathrm{m}$. It is made up of red and white square tiles of side $20 \mathrm{cm}$ as shown in the figure. Find the number of red and white tiles required.

If the area of the figures given below, where each square is of length $1 \mathrm{cm}$, is $k {\mathrm{cm}}^2$, then find the value of $k$.