SOLUTION: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees.

Algebra ->  Vectors -> SOLUTION: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees.      Log On


   

Question 289125: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: Recall that the angle between two vectors and , let's call it , can be represented in the equation:

where is the magnitude of and is the magnitude of .