Creo™ Schematics 4.0 Help Center > The Work Environment > Probes > Example: Center Probe
  
Example: Center Probe
The Center Probe snaps to the center of the nearest circle. For arcs, a center point is defined as the intersection of the two perpendiculars from the tangents at the ends of the arc. No position is located if the perpendiculars do not intersect inside the arc.
1. In an open sheet, click Geometry, and then click the arrow next to Line.
2. Select a line type from the list.
3. Click , and click near the arc or circle. A new line is started, snapping to the center of the arc or circle nearest the pointer.
4. Click an endpoint, and then right-click and choose Exit Tool from the shortcut menu.