On the Info menu, click Length Along.
LENGTH ALONG calculates the distance along an entity between two points on that entity.
The prompt reads "Select entity:" Select an entity with the pick cursor.
The prompt reads "From point on entity [entire entity]:" Select a starting point. If you right-click or press ENTER, the entire length of the selected entity will be displayed.
If you selected a point on the entity, the prompt reads "To point on entity:" Select the ending measurement point on the entity.
CC3 displays the distance in a message box, using the current distance display format (feet-and-inches, numeric, etc.) as specified by the UNITS command. Choose OK to clear the message.
Text equivalent: LENGTH