Results 1 to 3 of 3

Math Help - Two Ordered Pairs

  1. #1
    Newbie
    Joined
    Jun 2007
    Posts
    7

    Two Ordered Pairs

    I need to know how to calculate the degree of an angle based on two ordered pairs x1, y1, x2, y2
    x1 = 100
    y1 = 100
    x2 = 300
    y2 = 300
    How do I calculate the degrees??
    Thanks,
    Allen
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Quick's Avatar
    Joined
    May 2006
    From
    New England
    Posts
    1,024
    Quote Originally Posted by questforknowledge004 View Post
    I need to know how to calculate the degree of an angle based on two ordered pairs x1, y1, x2, y2
    x1 = 100
    y1 = 100
    x2 = 300
    y2 = 300
    How do I calculate the degrees??
    Thanks,
    Allen
    Do you want angle a?

    Code:
      /|\
       |
       |    +
       |   /   
       |  /
       | +_a____
    <--|------------->
       |
       |
      \|/
    If so then you're looking for slope in degrees form.

    It just so happens that the slope equals the tangent of angle a, so all you need to do is calculate the \tan^{-1} of the slope.

    For instance, your slope is 1, so the angle is: \tan^{-1}(1)=45^{\circ}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by questforknowledge004 View Post
    I need to know how to calculate the degree of an angle based on two ordered pairs x1, y1, x2, y2
    x1 = 100
    y1 = 100
    x2 = 300
    y2 = 300
    How do I calculate the degrees??
    Thanks,
    Allen
    Which angle? The angle that the line joining the points (x1,y1) and (x2,y2)
    makes with the horizontal? The angle between the vectors (x1,y1) and (x2,y2)? ...

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. ordered of pairs
    Posted in the Algebra Forum
    Replies: 5
    Last Post: December 7th 2011, 12:05 PM
  2. ordered pairs
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 12th 2011, 07:39 PM
  3. How many different ordered pairs?
    Posted in the Geometry Forum
    Replies: 4
    Last Post: November 12th 2008, 04:37 PM
  4. Ordered Pairs (x,y)
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: June 11th 2007, 04:04 PM
  5. Ordered Pairs (x, y)
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: January 18th 2007, 08:22 PM

Search Tags


/mathhelpforum @mathhelpforum