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Defining a vector in magnitude,angle form.

  1. Oct 21, 2014 #1
    I've learned that vectors can be defined in,basically, two ways. (1) Unit Vector Form (xi+yj+zk) (2)Magnitude angle form.
    The second form always adds a confusion in problems. For instance let's define a function A and B as:

    When we define -B why do we do it as follows:

    I mean why do we write it as -B isn't the information of the direction clear from the angle between A and the Blue line?
  2. jcsd
  3. Oct 21, 2014 #2


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    You may not always have a diagram to refer to, especially if your vector calculations get long and involved.
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