Afarmer wants to construct a rectangular shaped fenced-in area on his property. to do so, he plans on using a river that runs in a straight line along the back of his property as one of the side of his rectangle. he will use the 300 feet of fence he has to build two sides perpendicular to the river and one side parallel to the river what is the largest area of his yard he convention? write your equation and answer the question that is asked