Part 3: Suppose the field has a length of 6,000 feet. Sally buys fencing to enclose it, but has bought 4 feet too much. Rather than throwing away the extra fencing, Sally enclose a slightly larger field by enlarging each side of the field by the same amount, so the fencing encloses the field and a border: W What is the largest animal that could be at point and be entirely within the border region, touching neither the fence nor the field? an ant a mouse an elephant a cat a cow Part 4: Give the average rate of change of the perimeter, if the length increases from 6,000 feet to 7,000 feet: