# What is the vector projection formula?

If we have two vectors A and B with an angle $\theta$ between them when they are joined tail to tail ( To remove ambiguity, $\theta < \pi$), then the projection of either vector (say, B) in the direction of A is the component of B along A and is given by, B $C o s \theta$.
Similarly, projection of A in the direction of B is A $C o s \theta$ .