Bond angles are the angles between adjacent lines representing bonds, and they greatly contribute to a molecule's molecular geometry. The bond angle helps create linear, trigonal planar, tetraheral, trigonal-bipyramidal, and octahedral shapes. The ideal bond angles are the angles that give the maximum angle where it would minimize repulsion, thus verifying the VSEPR theory. The farthest way electrons can get away from each other is through angles. If they can, molecules tend to be 3 dimensional.
