Question

A rectangular piece of land measures $0.7km$ by $0.5km.$ Each side is to be fenced with $4$ rows of wire. What is the length of the wire needed?

Answer 1

Given: Dimension of the rectangular piece of land $=0.7km\times 0.5km$

Number of rows of wire needed to fence each side $=4$

Length of wire needed for $1$ row of wire $=$ Perimeter of the rectangular wire

$\therefore$ The required length of wire $=4$ $\times$ (perimeter of the rectangular land).

Perimeter of the rectangular land $=2$ $\times$ (length + breadth)

$=2\times (0.7+0.5)km$

$=2\times 1.2km$

$=2.4km$

$=2.4\times 1000m$ [$\because 1km=1000m$ ]

$=2400m$

Thus, the required length of wire $=4\times 2400=9600m=9.6km$