To calculate efficiently with vectors, we need something more than geometric arrows - we need a numerical representation of the vectors. We obtain a numerical representation by using coordinate systems for 2-space or three space and adapting the method for representing points in a coordinate system to a method for representing vectors.

In this learning object, we'll

  1. Review rectangular coordinate systems in the plane and then use them to describe vectors in 2-space,
  2. Describe rectangular coordinate systems in 2-space and how to use them to describe vectors in 3-space,
  3. Use vector components to calculate sums and scalar multiples of vectors,
  4. Use vector components to calculate the length of a vector.
Prerequisites: You should understand how to carry out basic vector operations geometrically.
Keywords: coordinates, components, i, j and k, position vector, norm, length, normalized vector