Measure Distance
Find the distance between two points on the model.
- 
                In the main window toolbar, click 
                    Measurements.
             - In the dialog, click the Distance tab.
 - 
                In the modeling window, pick two points on the model
                    surface.
                The dialog will display the distance between the two points.Note: The points do not have to lie on the same face; the distance is measured directly through 3D space, not along the model surface.
 - Click Close.