Creo Options Modeler > References > Fundamentals > Creo Parametric User Interface > The Analysis Tab > Measuring Geometry > Measuring Entities > Using Specific Measurement Types > Length > About Measuring Length
  
About Measuring Length
If you select two or more measurable reference entities, the total length for all the entities is reported. The selected entities do not have to be connected, and they do not have to be the same entity type.
You can measure length for the following entity types:
Linear
Linear edge or sketch segment
Facet edge
Intersection that results in a linear entity
Curve
Edge
Curve
Facet edge
Sketch segment
Cable or pipe centerline
Radial or diametral curve
2D arc, fillet, or circle
Radial or diametral edge, curve, or scanned curve
Cable or pipe centerline