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?
Each side should be fenced with four rounds of wire.∴ length of wire required =4× perimeter of land
perimeter of land =2(l+b)=2(0.7+0.5)
=2.4km
∴ length of wire required =4×2.4=9.6km
∴9.6km length of wire is required to lay 4 rounds of fence.