Question

Find the cost of fencing a square park of side $250$ $m$ at the rate of Rs $20$ per metre.

Answer 1

$\text{Side of square}$ = $250$ $m$ 
Perimeter $\text{of square}$ = $4 \times \text{side}$ 
= $4 \times 250$
= $1000$ $m$ 
$\text{Since, cost of fencing of per meter}$ = $₹$ $20$ 
$\text{Therefore, the cost of fencing of 1000 meters}$ 
= $20 \times 1000$ 
= $₹\;20,000$