Using the perimeter of a rectangle, the length of wire required is calculated as: 8.4 km.
What is the Perimeter of a Rectangle?
A rectangle with a length of "l" and a width of "w" has a perimeter which is calculated using the formula below:
Perimeter of rectangle = 2(l + w).
The length of wire required = the perimeter of the island × 3
Length of the island = 0.9 km
Width of the island = 0.5 km
The length of wire required = 2(0.9 + 0.5) × 3
The length of wire required = 2(1.4) × 3
The length of wire required = 2.8 × 3
The length of wire required = 8.4 km.
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