[Graphs generated by this script: initPicture(-1,11,-2,11);line([0,0],[1,4.3]);line([1,4.3],[10,0]);line([10,0],[0,0]);strokedasharray="3 5";line([1,0],[1,4.3]);text([1,2.15],"4.2 ft","right");text([5,0],"9.7 ft","below");]

Find the area of the triangle pictured above.

$\displaystyle \text{ft}^{{2}}$