Mathematics

The key is recognizing that fencing goes around the perimeter of the field, not across its area. Calculate the perimeter by adding all four sides (or using $P = 2(l + b)$), then multiply by the cost per metre. This transforms a geometry problem into a straightforward multiplication once you identify what distance actually needs fencing.

The key is recognizing that fencing goes around the perimeter of the field, not across its area. Calculate the perimeter by adding all four sides (or using $P = 2(l + b)$), then multiply by the cost per metre. This transforms a geometry problem into a straightforward multiplication once you identify what distance actually needs fencing.