On the Info menu, click Distance.
DISTANCE calculates the distance between two points.
The prompt reads "Distance from:" Select a point with the crosshairs and left button, or type numeric coordinates.
The prompt reads "Distance to:". Select a second point. 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 (Specs > Units). Choose OK to clear the message.
Please note: You can also use the LIST command (Info > List) to find the length of an existing line entity.
Text equivalent: DIST