The area of a circle inscribed in a square of side $28 \mathrm{cm}$ is $\mathrm{k} {\mathrm{cm}}^2$. Find the value of $\mathrm{k}$.

[Hint: Diameter of the circle is equal to the side of the square, take $\mathrm{\pi }=\frac{22}{7}$]

If the length of a side of the square is equal to that of the diameter of a circle, then the ratio of the area of the square and that of the circle is:

$\left(\pi =\frac{22}{7}\right)$

A spherical ball of diameter $35 \mathrm{cm}$ rolls $20$ times. How much is the distance (in $\mathrm{m}$) covered by it?

(Take $\pi =\frac{22}{7}$)

Find the area in square centimeter of the shaded region in the given figure, where $ABCD$ is a square of side $14 \mathrm{cm}$. [Take $\pi =\frac{22}{7}$]

A wire when bent in the form of a square encloses an area of $484 sq. cm$. If the same wire is bent in the form of a circle, what is the area enclosed by it?