question_answer 5)

A rectangular 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? TIPS Firstly, find the perimeter of rectangular piece of land and then multiply by 4 to find the length of wire.

Answer:

Given length of piece of land = 0.7 km and breadth of piece of land = 0.5 km \[\therefore \]Perimeter of the rectangular piece of land \[=2\times \] (Length + Breadth) \[=2\,\,\times (0.7+05)km\] \[=2\times 1.2\,km=2.4\,km\] Then, length of wire fencing for 1 row = Perimeter of rectangular piece of land = 2.4 km \[\therefore \] Length of wire fencing for 4 rows \[~=4\times 2.4\text{ }km\text{ }=9.6\text{ }km\] Hence, the wire of length 9.6 km is needed.