Find the angle formed when [4,4,2] and [4,3,12] are placed tail to tail ; then find the components of the vector that results when [4,3,12] is projected onto [4,4,2].

My answer is 48.189 for the angle.

101 = 169 + 36 - 2X13X6Xcos a

cos a = 0.666666667

a=48.189

Is it correct?

For the second part, I am not sure what it means to project a vector onto another one.

Thanks.