The diameters of front and rear wheels of a tractor are $80 \mathrm{cm}$ and $2 \mathrm{m}$, respectively. Find the number of revolutions that rear wheel will make in covering a distance in which the front wheel makes $1400$ revolutions. 

Sides of a triangular field are $15 \mathrm{m}$, $16 \mathrm{m}$ and $17 \mathrm{m}$. With the three corners of the field a cow, a buffalo and a horse are tied separately with ropes of length $7 \mathrm{m}$each to graze in the field. Find the area of the field which cannot be grazed by the three animals. 

Find the area of the segment of a circle of radius $12 \mathrm{cm}$ whose corresponding sector has a central angle of $60°.$(Use $\mathrm{\pi }=3.14$)

In figure, $ABCD$ is a trapezium with $AB\left|\right|DC. AB=18 \mathrm{cm}, DC=32 \mathrm{cm}$ and distance between $AB \mathrm{and} DC=14 \mathrm{cm}.$ If arc of equal radii $7 \mathrm{cm}$ with centres $A,B,C \mathrm{and} D$have been drawn, then find the area of the shaded region of the figure. 

Three circles each of radius $3.5 \mathrm{cm}$ are drawn such a way that each of them touches the other two. Find the area enclosed between these circles.

Find the area of the sector of a circle of radius $5 \mathrm{cm}$, if the corresponding arc length is $3.5 \mathrm{cm}$.