Dimension from face of circle to face of circle?

[ljlange]

HI any one out there know how to dimension from outside face to outside face of a circle? I need to dimension "Between" posts, and I am clicking in circles myself!
Cheers
Liza

[Mike Sealander]

I believe you can snap to a circle's quadrant (SQ is the keyboard snap toggle for quadrant). You can also create an Is Reference reference plane in your family, and Revit will snap to that.