The diameter of a circle is $5.6 \mathrm{cm}$. If its circumference is $x \mathrm{cm}$, then find the value of $x$. (Take $\mathrm{\pi }=\frac{22}{7}$)

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 $\pi =\frac{22}{7}$]

The wheels of a car are of diameter $80 \mathrm{c}\mathrm{m}$ each. How many complete revolutions does each wheel make in 10 minutes when the car is traveling at a speed of $66 \mathrm{k}\mathrm{m}$ per hour? $\left(\mathrm{use} \pi =\frac{22}{7}\right)$

Only one circle can be drawn through three non collinear points.

Pragya wrapped a cord around a circular pipe of radius $4 \mathrm{c}\mathrm{m}$ (adjoining figure) and cut off the length required of the cord. Then she wrapped it around a square box of side $4 \mathrm{c}\mathrm{m}$ (also shown). Did she have any cord left? ( $\mathrm{\pi }=3.14$).