A rectangle of dimensions $16\mathrm{cm}\times 12\mathrm{cm}$ is inscribed in a circle. Find the area enclosed between the circle and the rectangle.

In the adjoining figure, $ABCD$ is a square of side $20 \mathrm{cm}$. Four circles of equal radii $7 \mathrm{cm}$ are drawn on its four vertices. Find the area of the shaded region. (Use $\mathrm{\pi }=3.14$)

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