Question 1158306
<pre><font size=5><b>We want to find y:

{{{drawing(800,5200/11,-2,20,-2,11,

triangle(18,0,8,0,8,sqrt(80)), triangle(0,0,8,0,8,sqrt(80)),
locate(0,0,E), locate(8,9.4,F), locate(18,0,G),
locate(4,0,8), locate(13,0,10), locate(8.2,4.6,h),locate(3.4,4.5,x),
locate(12.8,5,y)
  )}}}{{{matrix(15,3,

x^2,""="",h^2+8^2,
y^2,""="",h^2+10^2,
x^2+y^2,""="",18^2,
(h^2+8^2)+(h^2+10^2),""="",18^2,
(h^2+64)+(h^2+100),""="",324,
h^2+64+h^2+100,""="",324,
2h^2+164,""="",324,
2h^2,""="",160,
h^2,""="",80,
h^2+10^2,""="",y^2,
80+100,""="",y^2,
180,""="",y^2,
sqrt(180),""="",y,
sqrt(36*5),""="",y,
6sqrt(5),""="",y )}}}

</font><pre>Edwin</pre>