From Molekel

ReferenceGuide: Angles and Distances

Molekel can compute and display:

• Distance between two atoms (enabled when two atoms selected)
  • Select two atoms and press the Measure toolbar button or select the Analysis-Compute Distance menu item;
• Angle among three atoms (enabled when three atoms selected)
  • Select three atoms and press the Measure toolbar button or select Analysis-Compute Angle menu item
• Dihedral angle (enabled when four atoms selected)
  • Select four atoms and press the Measure toolbar button or select Analysis-Compute Dihedral Angle menu item

The computed data is displayed in the status bar.

To enable multiple atom selection:

1. Enable molecule interaction
2. Enable picking of individual atoms
3. Select the molecule
4. Hold down the Shift key while selecting the atoms