1. The problem statement, all variables and given/known data Hi Say I have a vector v=(vx, vy, vz) that makes an angle α with the x-axis. The amount of v projected onto the x-axis I find from the dot product v.x = √(vx2 + vy2 + vz2)cos(α) I am also interested in finding the amount of v in the plane normal to the x-axis, i.e. I want to project v onto the y-z plane. Is this simply given by v.(y + z)?