Length calculations may be obtained for any line segment, polygon side or vector. Distance calculations are available between two points, or the perpendicular distance between a point and a line, segment, polygon side, or vector. Use these steps:
| 1. | Select  the line segment, or point and line, or pair of points as described above. |
| 2. | Click the tab to switch from Real to Symbolic output or vice versa. |
| 3. | Click the Distance / Length tool in the Calculate toolbox or select Distance / Length from the Calculate menu. |
Geometry Expressions displays the length, using any relevant parameters you may have specified.