Question 427361
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b>
Hi
Note: Diagonals of a Rectangle are equal to each other:
  3y/5 = 3(y-4)
   3y = 15(y-4)
   3y = 15y - 60
   60 = 12y
     y = 5    Diagonals are both 3 units  
{{{drawing(400,400,-2.5,2.5,-2.5,2.5, locate(0.05,-.05,E),
locate(-2.1,-1,B), locate(-2,1.2,A), locate(2,1.1,D), locate(2,-1,C),
green(line(-2,-1,2,1), line(-2,1,2,-1)),
line(-2,1,-2,-1), line(-2,-1,2,-1), line(2,-1,2,1), line(2,1,-2,1) )}}}