Question

A square lawn is 90m long. A fence is to be put around the lawn if the fence contains 4 rounds of barbed wire, find the cost of fencing it. The barbed wire costs ₹ 40 per metre

Answer 1

Cost of Barbed Wire =Rs.57600

Step-by-step explanation:

Given,

Side of Square Lawn=90m

Cost of 1m barbed wire=Rs.40

We know that,

$Perimeter\ of\ Square= 4\times side$

Perimeter of Lawn=$4\times 90m$

                              =360m

Since,it is given that wire is barbed in 4 rounds.

Total length of wire required =$4\times Perimeter\ of\ Wire$

                                                =$4\times 360m$

                                                =1440m

Now,Total Cost of Wire =$Length\ of\ wire\times Cost\ of\ 1m\ of\ wire$

                                      = $1440\times 40$

                                      =Rs.57600

Hence,Cost of Barbed Wire =Rs.57600

Answer 2

Given,

Side of Square Lawn=90m

Cost of 1m barbed wire=Rs.40

We know that,

Perimeter\ of\ Square= 4\times sidePerimeter of Square=4×side

Perimeter of Lawn=4\times 90m4×90m

=360m

Since,it is given that wire is barbed in 4 rounds.

Total length of wire required =4\times Perimeter\ of\ Wire4×Perimeter of Wire

=4\times 360m4×360m

=1440m

Now,Total Cost of Wire =Length\ of\ wire\times Cost\ of\ 1m\ of\ wireLength of wire×Cost of 1m of wire

= 1440\times 401440×40

=Rs.57600

Hence,Cost of Barbed Wire =Rs.57600