1. What are skew vectors?
Skew vectors are three dimensional vectors that never meet.
2. Can the length of a three dimensional vector be found?
Yes, just like the magnitude (length) of a two dimensional vector can be found using Pythagoras' Theorem √(x2 + y2 )
there is a similar formula for three dimensional vectors, √(x2 + y2 + z2) also derived from Pythagoras' Theorem.