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Finding an angle

  1. Jun 28, 2012 #1
    1. The problem statement, all variables and given/known data
    Find angle B


    2. Relevant equations
    Triangle makes 180 degrees


    3. The attempt at a solution
    I brought the red vector(Red Vector was given) down more to make a right triangle and got 55 degrees for C. I do not know where to go from there though to get angle B. Angle B is also 35 degrees but I don't know how they got that.



    [url=http://postimage.org/][PLAIN]http://s17.postimage.org/6onxtnlbz/Untitled.png[/url][/PLAIN]
     
    Last edited by a moderator: Jun 28, 2012
  2. jcsd
  3. Jun 28, 2012 #2

    eumyang

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    The line labeled "x" is parallel to the slope incline. The lines labeled "x" and "y" are presumably perpendicular. You should be able to take it from there.
     
    Last edited: Jun 28, 2012
  4. Jun 28, 2012 #3

    SammyS

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    What angle does the x-axis make with the y-axis ?
     
    Last edited by a moderator: Jun 28, 2012
  5. Jun 28, 2012 #4
    90 degrees
     
  6. Jun 28, 2012 #5

    SammyS

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    Then, what is the sum of (angle B) + (angle C) ?
     
  7. Jun 28, 2012 #6
    would it be 90 too? I also had another question, the angle where B is at, is that whole piece a another right triangle?
     
  8. Jun 29, 2012 #7

    eumyang

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    See attachment. I labeled another angle, D, in blue. Given that the line labeled "x" and the slope incline are parallel, what can you say about angles C and D?
     

    Attached Files:

  9. Jun 29, 2012 #8
    Are they equal to each other?
     
  10. Jun 29, 2012 #9

    eumyang

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    Yes.
     
  11. Jun 29, 2012 #10
    oh so these are two parallel lines cut by a transveral right?
     
  12. Jun 29, 2012 #11

    eumyang

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    Again, yes.
     
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