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Find the cost of fencing a square park of side $ 250 \mathrm{~m} $ at the rate of $ Rs.\ 20 $ per metre.
Given:
The side of the square park is $250\ m$.
To do:
We have to find the cost of fencing the square park of side 250 m at the rate of Rs. 20 per metre.
Solution:
The side of square park $ = 250\ m$
We know that,
The perimeter of a square with side $a$ is $4a$.
Therefore,
The perimeter of square park $ = 4\times$ each side of the square park
$= 4\times250$
$= 1000\ m$
Since,
The cost of fencing the square park $ = Rs.\ 20\ per\ m$
The cost of fencing the square park for $1000\ m = Rs.\ 20\times1000$
$ = Rs.\ 20,000$
The cost of fencing the square park of side 250 m at the rate of Rs. 20 per metre is $Rs.\ 20,000$.
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