I am a Civil Engineer engaged in structural design (concrete and steel), architectural design of residential, public and comercial buildings. I can create for you 2D CAD drawings, 3D architectural modelling in AutoCAD, 3ds MAX, Revit.
Cooperated on many projects from civil engineering, architecture and design of different products.
I am glad to cooperate, perform tasks quickly and efficiently.
MY ANSWER: when the circle is a shaft, axis. Or when the circle is too small compared with the drwing.