Arc 3 Entities Arc 3 EntitiesThe 3 Entities function creates an arc between the snap points of three wireframe entities or points. To perform the function, you click any three snap points in the graphics area.
To open Arc 3 Entities, do one of the following:
In the Arcs menu, click 3 Entities.
On the CAD toolbar,
click the down arrow and click the icon.
Right-click anywhere in the graphics area, point to CAD, Arcs, and click 3 Entities.
The parameters display in the 
Data Entry tab
of the Data-CAM Tree Manager.
The arc is created using only snap point selection.