A square field has side 20 m. Find the length of the wire required to fence it four times.

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 = 20m.

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 = 80m.

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 = 320m.

The required length of the fence is 320m.