Answer :

Consider a square field **ABCD**

According to the problem, it is given that the side length (**a**) of the square field is 20m.

i.e, **a** = **20**m.

We need to find the Perimeter of the square as the fencing covers only the surface of the square.

We know that the Perimeter(**P**) of the square of side length ‘**x**’ is given by **4x.**

So, The perimeter of the square **ABCD** is,

⇒ P = 4 × 20

⇒ **P = 80**m.

We need them to fence the square four times.

The required length(**L**) of the fence is given by:

**L** = **4P**

⇒ L = 4 × 80

⇒ **L** = **320**m.

The required length of the fence is **320**m.

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