Occasionally when I edit a new polygon feature I want to finish one side of it exactly where it meets the plane of an existing vertex of another feature (in order to create a 90 degree angle to that vertex).

This ability exists on autocad (as can be seen in the picture attached), but I haven't found a way to do that on arcgis desktop. I usually work around this problem by making bigger shapes than necessary and then trimming what I don't need.

Anybody know a solution? 

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/QYgBv.png