5 mi12.5 mi10 mi[Graphs generated by this script: initPicture(-1,5.5,-1,5.5);path([[0,0],[1,4],[3,4],[5,0],[0,0]]);text([2,4],'5 mi','above');text([2.5,0],'12.5 mi','below');text([1,2],'10 mi','right');strokedasharray="3 5";line([1,0],[1,4]);]

Find the area of the trapezoid pictured above.