Question

1 po
b) A rectangular field is of length 45 m and
breadth 25 m. It has to be fenced around with
barbed wire. Find the length of barbed wire
required to fence by giving 4 rounds. ​

Answer 1

$\huge{\boxed{\sf{\red{G}\green{i}\blue{v}\purple{e}\pink{n}:}}}$

The length of rectangular field = l = 45m

The breadth of the rectangular field = b = 25m

$\huge{\boxed{\sf{\red{To}\ \green{be}\ \blue{fo}\purple{un}\pink{d:}}}}$

Find the length of barbed wire

required to fence by giving 4 rounds.

Fencing is done on the perimeter.

Se we need to find perimeter first.

$\boxed{\boxed{\sf{Formula\ for\ finding\ Perimeter\ of\ rectangle= \red{2(l+b)units}}}}$

[∵ '$\red{l}$' is the '$\red{length}$' and '$\blue{b}$' is the '$\blue{breadth}$' of the rectangle ]

Now,

Perimeter = 2(l+b)

                 = 2 × (45 + 25)

                 = 2 × (70)

                 = 140 m

So,

The perimeter of the rectangular field  = $\boxed{\pink{\rm{140m}}}$

Now,

According to the question,

To fence four rounds the length of the barbed will be

= 4 × 140 = 560m

Therefore

$\pink{\rm The\ length\ of\ barbed\ wire\ required\ to\ fence\ by\ giving\ 4\ rounds.}$

= $\boxed{\boxed{\tt{560\ m}}}$

Answer 2

Given :-

• Length of rectangular field = 45 m
• Breadth of rectangular field = 25 m

Find :-

• Length of barbed wire which is required to fence 4 rounds.

Formula used :-

• Perimeter of rectangle =2(Length × Breadth)

According to the question,

= 2 ( Length × Breadth )

= 2 ( 45m + 25 m)

= 2 × 70 m

= 140 m

.°. Perimeter of rectangle is 140 m.

___________________________....

Length of the barbed wire which need to fence 4 rounds :-

= 4 × 140 m

= 560 m.