\n <b>Arguments:</b> Name + 1 vertex (for the center) + 1 edge (for
the direction) + Radius.
-\note Passing None as <b>Center Point</b> means Origin of global
-coordinate system, passing None as \b Vector means OZ axis of global
+\note By default it is presumed that the <b>Center Point</b> is located at the Origin of the global
+coordinate system, and the \b Vector corresponds to OZ axis of the global
coordinate system.
\image html circle1.png