1. The problem statement, all variables and given/known data 4. Consider the following two lines: L1: [1 2 1] + s [2 -1 1] , L2 = [3 0 1] + t [1 1 2] (by the way, all of those are column vectors. I just don't know how to format them correctly.) (a) These two lines intersect at a point P . Find the co-ordinates of P . (b) What is the cosine of the acute angle θ between these two lines ? 3. The attempt at a solution Well for a), I don't know if we are supposed to get the normal vector or not. If so, then I know to do the cross product. If that's not the proper solution then can I merely do P1P2 = P2 - P1, or is that completely irrelevant? I'm just really confused about the wording!