You want to build a field next to your bam in the shape of a trapezoid. Three sides of the trapezoid have equal length (see diagram): AB = BC = CD. The three sides of equal length will be built using a total of 36 meters of fencing, while the barn foms the fourth side. Find the largest possible area of the field. Make sure you clearly define your variables, and provide a clear final answer in words, which includes the appropriate units. Field Barn (Note: You may assume that the bam is at least 30 meters long.)