Bond angle in H2O according to VBT  is

If we apply VBT to explain the shape of water molecule,O-2s22px22py12pz1 ;H-1s1 ;The two half-filled p-orbitals of O-atom must overlap with half-filled s-orbitals of H-atoms ;p-orbitals are mutually perpendicular to each other;Bond angle must be around 900