To create an Arc in the Main Menu select New Entity - > Basic - > Arc
You can define an Arc by three Points that lie on it, where Point1 is the starting point and Point3 is the ending point of the arc.
The Result of the operation will be a GEOM_Object (edge).
TUI Command: geompy.MakeArc(Point1, Point2, Point3)
Arguments: Name + 3 vertices.
Example:
Our TUI Scripts provide you with useful examples of creation of Basic Geometric Objects.