Geometry Expressions will calculate any angle between lines in the geometry. Use these steps to find the angle:
| 1. | Select  two line types. |
| 2. | Click the tab to switch from Real to Symbolic output or vice versa. |
| 3. | Click the Angle tool in the Calculate toolbox or select Angle from the Calculate menu. |
The equation with real or symbolic terms appears in the diagram.
You can obtain the angle's supplement by dragging the angle symbol.