Question

A square piece of land has each side equal to 100 m. If 3 layers of metal wire has to be used to fence it, what is the length of the wire needed?

Answer 1

Side of the square field = 100 m
Wire required to fence the square field = Perimeter of the square field = 4 $\times$ Side of the square field
Perimeter = 4 $\times$100 = 400 m
This perimeter is the length of wire required to fence one layer.
Therefore, the length of wire required to fence three layers = 3 $\times$ 400 m = 1200 m