[Graphs generated by this script: initPicture(-1,11,-2,11);line([0,0],[5,2.2]);line([5,2.2],[10,0]);line([10,0],[0,0]);strokedasharray="3 5";line([5,0],[5,2.2]);text([5,1.1],"?","left");text([5,0],"9","below");]

Find the height of the triangle pictured above, if the area is 9.

Round your answer to the nearest tenth