The Circle tab of the Position dialog enables you to construct a circle and calculate the centre point.
This page contains the following:
Workspace — Select which workspace you are working in.
- World — Specifies the point relative to the global coordinate system.
- Workplane — Specifies the point relative to the active workplane. This option is available only when there is an active workplane and you are editing a non-active workplane.
- Relative — Specifies the point relative to the local origin.
indicates the current point, 
indicates the other available points. PowerMill cycles through the points as you make selections in the graphics window. Click to make it the current point, the arrow changes to .
Start Point — Specifies the coordinates of one of the three points which define the circle. These coordinates can be either typed or selected from the graphics window.
End Point — Specifies the coordinates of one of the three points which define the circle. These coordinates can be either typed or selected from the graphics window.
Mid Point — Specifies the coordinates of one of the three points which define the circle. These coordinates can be either typed or selected from the graphics window.
Centre point — The centre point of the defined circle. The centre point always respects any locks that are set on the Cartesian or Polar tabs. For example, if Z is locked when defining a circle, the values of X and Y coordinates correspond to the defined circle, but the Z coordinate value remains unchanged.
Radius — Radius of the defined circle.
Diameter — Diameter of the defined circle.
The Centre point, Radius, and Diameter of the circle are automatically calculated from the Start, End, and Mid points and cannot be edited.
Reset all — Resets the Start, End, and Mid points.
Become origin —The point defined becomes the item origin. Any relative coordinates are then measured from this origin.