Sukhram wants to fence his land with $6$ rows of wire. The length and the breadth of his land are $18.5 m$ and $9.5 m$ respectively. Find the length of the wire required.

(i) $1$ kilometre $=1000$ metre $\left(\mathrm{m}\right)$

(ii) $1$ metre $=100$ centimetre $\left(\mathrm{cm}\right)$

(iii) $1$ decimetre $=10$ centimetre $\left(\mathrm{cm}\right)$

(iv) $1$ metre $=10$ decimetre $\left(\mathrm{dm}\right)$

(v) $1$ centimetre $=10$ millimetre $\left(\mathrm{mm}\right)$

(vi) $1$ foot $=12$ inches

(vii) $1$ yard $=3$ feet

(viii) $22$ yards $=1$ chain

2. Plane Figures and their Area and Perimeter:

(i) A closed plane figure together with its interior is called the region enclosed by it.

(ii) The sum of lengths of all sides of a plane figure or the length of its boundary is called the ‘Perimeter’ of the figure.

(iii) The measurement of the region enclosed by a closed plane figure is called the ‘Area’ of the plane figure.

(iv) A square centimetre is the area of the region formed by a square of side $1 \mathrm{cm}$.

3. Standard Units of Area:

(i) $100\mathrm{ }{\mathrm{mm}}^2=1\mathrm{ }{\mathrm{cm}}^2$

(ii) $100\mathrm{ }{\mathrm{cm}}^2=1\mathrm{ }{\mathrm{dm}}^2$

(iii) $100\mathrm{ }{\mathrm{dm}}^2=1\mathrm{ }{\mathrm{m}}^2$

(iv) $10000\mathrm{ }{\mathrm{cm}}^2=1\mathrm{ }{\mathrm{m}}^2$

(v) $100\mathrm{ }{\mathrm{m}}^2=1\mathrm{ }\mathrm{are}$

(vi) $100$ ares $=1$ hectare

(vii) $100$ hectares $=1\mathrm{ }\mathrm{sq}. \mathrm{km}.$

4. Perimeter and Area of Rectangle and Square:

(i) The perimeter of a Rectangle $=2$ (length$+$breadth) or $P=2(l+b)$

(ii) The perimeter of a Square $=4\times \text{(Side) or,}\mathrm{ }P=4l$

(iii) The area of a Rectangle $=$ Length $\times$ breadth or $A=l\times b$

(iv) Also, the length of a Rectangle $=\frac{\text{Area}}{\text{Breadth}}$ or $l=\frac{A}{b}$

(v) The breadth of a Rectangle $=\frac{\text{Area}}{\text{Length}}$ or $b=\frac{A}{l}$

(vi) The area of a Square $={\text{(Side)}}^2$ or $A=\mathrm{ }{l}^2$