Question 1168087
<pre>

{{{drawing(400,3440/17,-2,15,-2,6.6,

triangle(0,0,1.923076923,4.615384615,13,0), locate(0,0,B),
locate(13,0,C), locate(2,5.3,A), line(6.5,0,6.5,2.708333333),
locate(6.5,0,D), locate(6.4,3.5,E),
locate(3.25,0,13/2),locate(9.75,0,13/2),locate(.52,2.9,5),
locate(4.1,4.4,6),locate(9.7,2,6),locate(6.63,1.5,x) 

   )}}}

All you need do to finish is to apply the Pythagorean theorem
to right triangle CDE to find x, which is the length of DE.

Edwin</pre>