A square lawn is surrounded by a path $2.5 \mathrm{m}$ wide. If the area of the path is $165 {\mathrm{m}}^2$, find the area of the lawn.

Calculate the area of the shaded region in the figure given below:

If the area of the shaded region is $k {\mathrm{m}}^2$ in the below figure, then find the value of $k$.

Calculate the area of the shaded region in the below figure:

Calculate the area of the shaded region in the figure given below.
Figure has uniform width of $3$ cm and it is given that $AB=CD$.

In the given figure, all steps are$0.5 \mathrm{m}$ high. Find the area of the shaded region.