Question

Question #3597d

Answer 1

`||B||costheta` is the projection of `vecB` along the direction of `vecA`.

Explanation:

The scalar (dot) product of `vecA` and `vecB` is defined by

`vecA*vecB=ABcostheta`

where `A` and `B` are the respective magnitudes of `vecA` and `vecB` and `theta` is the angle between `vecA` and `vecB`.