Question

A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to befenced with 4 rows of wires. What is the length of the wire needed?

Answer 1

Length of a single row of fire can be given as perimeter of a rectangle.
Perimeter of a rectangle, `P = 2(l+b)`
`P = 2(0.7+0.5) = 2.4 km`
So, length of wire that has 4 rows `= 4**2.4 = 9.6km`