The Inquire button allows you to request geometric information directly from the view window when you click on the atoms of interest. Note that the selected atoms do not needed to be bonded.
Figure 9. Inquire Mode Display
This display shows the value of the selected bond angle in the window's lower
left corner.
The number of atoms that you select affects the resulting display on the view window
1 atom: Atom type and numbering.
2 atoms: Bond length (distance).
3 atoms: Interatomic angle.
4 atoms: The 4-3-2-1 dihedral angle.