How is the hybridization of an atom determined as $sp$,$sp^2$,or $sp^3$?

(N/A) The hybridization of an atom is determined by the bond angle and the molecular geometry.
$1.$ If the bond angle is $180^{\circ}$ and the geometry is linear,the hybridization is $sp$.
$2.$ If the bond angle is $120^{\circ}$ and the geometry is trigonal planar,the hybridization is $sp^2$.
$3.$ If the bond angle is $109.5^{\circ}$ and the geometry is tetrahedral,the hybridization is $sp^3$.