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, Point2 is a middle point of the arc 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.