title: How to calculate depth coordinate of the 3D rectangle?
body: <p><img src="https://i.stack.imgur.com/Mmn4r.png" alt="Rectangle"></p>
  
  <p>I have 3D rectangle, as shown in the image.</p>
  
  <p>Here I know depth distance and x and y coordinates of the one end. Based on these two values I would like calculate coordinates at the other end.</p>
  
  <p>For clear view, I have attached a screen.</p>