Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Angle between vectors

  1. Apr 1, 2010 #1
    how to find two vectors that make an angle of 60O with v=<3,4>??

    can i let b=<x,y>, then


  2. jcsd
  3. Apr 1, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi hazellaw! Welcome to PF! :smile:

    (have a square-root: √ and a degree: º :wink:)
    That'll certainly do it. :smile:

    But easier would be

    i] use <cosθ,sinθ> instead of <x.y>

    or ii] write <3,4> in polar form (r,θ)

    or iii] find the line perpendicular to <3,4>, and go along it the appropriate distance. :wink:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook