Curve Length
This tool works exactly the same as the Measure Distance.Click on a 2D or 3D curve. Its length is displayed in the Measurement Info Palette. 
Select a second point on the curve to measure a partial length of the curve. 
This tool works exactly the same as the Measure Distance.Click on a 2D or 3D curve. Its length is displayed in the Measurement Info Palette.
Select a second point on the curve to measure a partial length of the curve.