[Graphs generated by this script: initPicture(-1,11,-2,11);line([0,0],[1,5.8]);line([1,5.8],[10,0]);line([10,0],[0,0]);strokedasharray="3 5";line([1,0],[1,5.8]);text([1,2.9],"4.2 feet","right");text([5,0],"7.2 feet","below");]

Find the area of the triangle pictured above.

Area = square feet