VectorsInSpace

# Vectors

A **vector** is an orientated segment. We represent it by *AB*, where *A* is the origin and *B* is the extreme.

The characteristics of a vector are:

– **Magnitude or length**,*|AB|*: the length of the segment.

– **Direction**: the direction of the straight line that contains it and the direction from the origin to the extreme (**sense**).

Each vector is defined by its magnitude, direction and sense.

Two vectors are said to be **equipollent** if they have the same magnitude, direction and sense. A set of vectors that are equipollent to each other is called **free vector** and its magnitude, direction and sense are the ones of any of the vectors of the set.

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