Vector Magnitude
A two dimensional vector can be written using the notation
3i+4j. What is its magnitude?
The magnitude of a vector is the square root of the
sum of the squares of the magnitudes of its components.
The components of a vector written in vector
notation (i.e., Xi+Yj) are the terms that are
added together (Xi and Yj, in this case).
The magnitude of a component along one of the coordinate
axes, such as Xi, is simply the number X.