Creo Options Modeler > References > Fundamentals > Creo Parametric User Interface > The Analysis Tab > Measuring Geometry > Measuring Entities > Using Specific Measurement Types > Distance > Using Reference Entity Options > Example: Center Option
  
Example: Center Option
The Center Option Is Not Selected for the Curve
The distance is measured from the arc-shaped curve to the second selected entity.
The Center Option Is Selected for the Curve
The distance is measured from the center of the arc-shaped curve to the second selected entity.