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Homework Help: Figuring out angle?

  1. Sep 12, 2007 #1
    figuring out angle???

    1. The problem statement, all variables and given/known data
    consider 2 points on a graph with coordinates (9.9m,-10m) and (-10m,1.8m)
    the lenght of the line that intersects the two points is equal to 23.135,,, the resulting triangle has measurements of 11.9, 19.9 and 23.135.

    What is the angle between the line connecting the 2 points and the x axis. measured counter clockwise. answer in units of degreess

    3. The attempt at a solution

    when i try to find the cos(a)=11.9/23/135 i get cos(a) = .514

    when i get the sin(a)= 19.9/23.135 = .860

    my batteries on my graphing calculator just crapped out on me... im not sure what a is equal to in both those equations.. im thinkin they might be diff values unless i am goin crazy
  2. jcsd
  3. Sep 12, 2007 #2
    ooops nevermind i just got it... they were the same i was calculating with .154.. damn dyslexic habits
  4. Sep 12, 2007 #3


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    Science Advisor
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    Gold Member

    I believe you meant to say 11.8, not 11.9; also, it appears that the angle you are calculating is with respect to the y axis, but the problem asks for the angle with respect to the x axis.
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