Outline Arcs are smooth curves in a part-circle shape. They are defined by two end points and an intermediate point to define the arc’s radius. To draw, click the first point of an arc (pick surface if needed), then click the other end point, and then move the mouse and click on a middle arc point so that desired Arc is drawn. An Arc can also start or end on another Outline’s end point. Arcs can also be joined by fillets to other Outlines.
An arc can also use the Radius Control drop down on the ribbon toolbar to define one with a preset radius, or via its Properties. See also Radius Library.