created 08/26/97; revised 08/10/00; 07/22/03; 07/22/09; 01/10/15

This chapter discusses the **length** of vectors
and how length is computed using the column matrix
representation of vectors.
The next chapter will discuss another vector property, **direction**.
Vectors of all dimensions have length and direction.
But to make the discussion easier to visualize most
of the examples in this chapter use vectors in 2D space.

- Length of 2D and 3D vectors
- Pythagorean formula
- Calculating the length of a vector from its column matrix representation
- Length of the zero vector
- Length of a negated vector

What do you suppose is the length of the vector
represented by:
(3, 0)^{T} ?