A farmer wants to fence his rectangular field measuring $14 \mathrm{m} \mathrm{by} 10 \mathrm{m}$, one of whose lengths is along the boundary wall of his house. The required length of the fence is:

A paper is in the form of a rectangle of dimension $21 \mathrm{cm} \mathrm{by} 15 \mathrm{cm}$. A semicircle along its length is cut off. The area of the remaining part is:

If semicircles are cut off from along each of the two breadths of a rectangle, then the perimeter of the remaining part is:

Two rectangular strips of metal each measuring $50 \mathrm{cm} \mathrm{by} 10 \mathrm{cm}$ are welded to form a  '+' symbol as shown. This logo is to be painted red on both sides. The surface area to be painted is:

The area of a circular track whose outer and inner radius is $5 \mathrm{cm} \mathrm{and} 4 \mathrm{cm}$ is:

Meenakshi is to bend a wire to form a logo of dimensions as shown in the given figure. The length of wire required is: