A farmer uses the river bordering his property and fencing to create a large grazing paddock for his horses, as shown in the diagram below.
The fencing has 4-strand wiring which is also shown below.
Given that fencing is not required on the river boundary, how many kilometres of wire will be required to fence the rest of the paddock? (2 marks)
--- 4 WORK AREA LINES (style=lined) ---