I think there's a way to do this but I can't seem to find the instructions. Once you have an object drawn and you are ready to start drawing another object how can you set the first point of the 2nd object a known distance from a point on the first object.

Let's say you drew a square starting at 10,10 which has a dimension of 5.75. Now lets say that you want to draw a circle that is 8 units to the right of the upper right hand corner and 4 units up from the upper right hand corner of the square.

In my example you know what size the square is so you can do the math in your head but you don't always know what size objects are when you're drawing and it would be nice to hover over the upper right hand corner of the square and then enter something like @8,4--from that point I just hovered over..