I have an Arc that was created when I selected an edge on a slot in a sketch and selected Convert Entities. I am able to convert that arc into a circle by dragging one point down to another point. This works well, but I would like to mimic that behavior in a macro where I can get the coordinate of a selected point and move it to another point to make a circle. I found some API methods like DragTo in IModelDoc2, but it seems like I can't find the correct point to use. There is also MoveOrCopy in IModelDocExtension, but I still do not get the results I am looking for. How can I programatically get this completed without using SelectByID or SelectByRay?