Question

A rectangular piece of land measures $0.7$ km by $0.5$ km. Each side is to be fenced with four rounds of wire. What length of wire is needed?

Answer 1

Each side should be fenced with four rounds of wire.

$\therefore$ length of wire required $=4\times$ perimeter of land

perimeter of land $=2(l+b)=2(0.7+0.5)$

$=2.4km$

$\therefore$ length of wire required $=4\times 2.4=9.6km$

$\therefore 9.6km$ length of wire is required to lay 4 rounds of fence.