A rectangular piece of land measures $ 0.7 \mathrm{~km} $ by $ 0.5 \mathrm{~km} $. Each side is to be fenced with 4 rows of wires. What is the length of the wire needed?
Given:
A rectangular piece of land measures $ 0.7\ km $ by $ 0.5\ km$
Each side is to be fenced with 4 rows of wires.
To do:
We have to find the length of the wire needed.
Solution:
We know that,
Perimeter of a rectangle of length $l$ and breadth $b$ is $2(l+b)$
The length of the rectangular piece of land $ = 0.7\ km$
The breadth of the rectangular piece of land $ = 0.5\ km$
Therefore,
The perimeter of the land $ = 2(0.7+0.5)$
$ =2(1.2)$
$ =2.4\ km$
Each side is to be fenced with $4$ rows of wires
This implies,
The length of the wire needed $=4\times$ perimeter of the land
$ = 4\times2.4\ km$
$ =9.6\ km$
The length of the wire needed is $9.6\ km$.
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