Question

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? 

Answer 1

Since the 4 rows of wires are needed. Therefore the total length of wires is equal to 4 times the perimeter of rectangle.

Perimeter of field = 2 x (length + breadth) 

= 2 x (0.7 + 0.5) 

= 2 x 1.2 

= 2.4 km 

= 2.4 x 1000 m 

= 2400 m 

Thus, the length of wire = 4 x 2400 = 9600 m = 9.6 m