To Measure the Distance Along an Element

Select the Measure Distance tool ( Drawing > Analyze > Measure ).
In the tool settings window, set Method to Along Element.
Select the element at the origin (the point from which to measure).
Enter a data point to define a point along the element. The distance from the origin along the element is displayed in the status bar.
If the element is closed, this data point defines the direction (clockwise or counterclockwise) in which measurements are made.
Do one of the following:

Enter a data point(s). The distance along the element from the origin is displayed in the Distance field.

or
Reset to return to step 3.