I know how to do this with basic trig: cah cos = a / h = 3 /5 cost -1 (3/5) = 53.13

How do I do this with linear algebra and show my steps using the proper formulas?

cost feta = ( vec(u) dot (vec v) ) / ((length of vec v)(length vec u))

or proj u V = (((vec u)(vec u) / (vec u)^2 )(vec u)

I guess I need to figure out how to do get vec u and vec v to use in the formulas.