Question

the perimeter of a rectangular field is 120 M its breadth is 20 cm find its length​

Answer 1

Answer:

$\boxed{\bf{\red{59.8\:m}}}$

Step-by-step explanation:

Perimeter of a rectangular field is the sum of all sides of the rectangular field .

We know that the opposite sides are equal in length .

Let one opposite side be l and let the other opposite side be b .

So if we add up the values of the four sides , we will get the perimeter .

l + l + b + b = 120 m

⇒ 2 l + 2 b = 120 m

⇒ 2 ( l + b ) = 120 m

Divide both sides by 2 :-

⇒ l + b = 60 m

Now it is given that the breadth is 20 cm .

We know that 1 m = 100 cm .

100 cm implies 1 m .

20 cm implies 20/100 m

⇒ 0.2 m

So the value of b is 0.2 m

l + 0.2 m = 60 m

⇒ l = 60 m - 0.2 m

⇒ l = 59.8 m

The length of the field is 59.8 m .

Answer 2

$\underline{\bold{Given:}}$

Perimeter of a rectangular field = 120m.

Breadth = 20cm.

$\underline{\bold{To\:Find}}$

Length.

$\bold{Let\:the\:length\:be\:x}$

we know that,

$\boxed{\bold{Perimeter =2\times( l + b )}}$

According to the question,

$\implies{Perimeter = 2\times ( l + b )}$

$\implies{\dfrac{120m}{2}= x + 20cm}$

$\implies{60m = x + 20cm}$

$\implies{60m - 20cm = x}$

Let convert both into cm....

$\implies{6000cm - 40cm = x }$

$\implies{5980cm = x}$

Therefore the final answer is:

$\boxed{\bold{Length = 5980cm= 59.8m}}$