Question

3. A rectangular field is 120 m long and 90 m wide. Find the
length of wire needed to fence the field. Also, find the cost
of the fence, if fencing costs ₹4.05 per metre.​

Answer 1

Answer:

₹87480

Step-by-step explanation:

Length of wire needed = 2(L+B)

= 2(120x90)

= 2x10800

=21600m

Cost of 1 m =₹4.05

Cost of 21600m = ₹(4.05x21600)

₹87480

Answer 2

Given:

A rectangular field is 120 m long and 90 m wide.

To find:

The length of wire needed to fence the field. Also, the cost of the fence, if fencing costs ₹4.05 per metre.

Solution:

The length of the wire needed to fence the field is 420 m and if the fencing costs ₹4.05 per metre then the cost of the fence is ₹1701.

We can find the length of the wire and fencing cost by doing the following steps:

First of all, we will find the perimeter of the rectangular field.

So,

as given,

The length of the rectangular field, l = 120m

The breadth of the rectangular field, b= 90m

So,

the perimeter is

$= 2(l + b)$

$= 2(120 + 90)$

$= 2(210)$

$= 420 \: m$

Now,

As given,

1 m fencing costs = ₹4.05

So, 420 m fencing costs

$= 4.05 \times 420$

$= ₹1701 \:$