A rectangle piece of land measures 0.7 km by 0.5 km. Each side is to be fenced with 4 rows of wires. What is the length of the wire needed?
It is given in the question that,
Length of land, l = 0.7 km
Breadth of land, b = 0.5 km
We know that,
Perimeter = 2 × (l + b)
= 2 × (0.7 + 0.5)
= 2 × 1.2
= 2.4 km
Now, one round of fencing the piece of land will require 2.4 km of wire. Thus, four rounds of fencing will require = 4 × 2.4 = 9.6 km