The altitude of the frustum of a regular rectangular pyramid is $5 \mathrm{m}$, the volume is $140 \mathrm{cu}. \mathrm{m}.$ and the upper base is $3 \mathrm{m}$ by $4 \mathrm{m}$. What are the dimensions of the lower base in $\mathrm{m}$?

What is the area of this trapezoidal garden (All measurements are in cm)? 

1. $60$ sq.cm
2. $180$ sq.cm
3. $210$ sq.cm 
4. $240$ sq.cm

A semi - circle of diameter $1$ unit sits at the top of a semi-circle of diameter $2$ units. The shaded region inside the smaller semi-circle but outside the larger semi-circle is called a lune . The area of the lune is -

The perimeter and the breadth of a rectangle are $52 cm$ and $12 cm$ respectively. Find its area in $c{m}^2$.