Results 1 to 17 of 17

Thread: Triginomotry(sp?)

  1. #1
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default Triginomotry(sp?)

    Well, i'm learning the whole , SIN COS TAN thing, and i get it for the most part, but for some reason, im confused on this one problem..


  2. #2
    Join Date
    Feb 2006
    Location
    Tracy/Davis, California
    Posts
    12,631
    Mentioned
    135 Post(s)
    Quoted
    418 Post(s)

    Default

    i r stupod.
    Last edited by YoHoJo; 01-05-2010 at 10:21 PM.

  3. #3
    Join Date
    Mar 2007
    Posts
    3,042
    Mentioned
    1 Post(s)
    Quoted
    14 Post(s)

    Default

    Presumably there's a right angle where side x and the side going across the top meet, so there's a total of 90 degrees being shared by those two angles. The second angle should have a measurement of 22 degrees. Since you have an opposite and adjacent angle, you can use tangent, so you'll set up your equation like this:

    tan(22) = 20/x

    which then simplifies to:

    x = 20/tan22

    which can be worked out on a calculator.

    Quote Originally Posted by YoHoJo View Post
    Any idea what rule your supposed to be using on this? Can you tell me some rules you learned recently? Maybe then I can help me.
    It's just simple trigonometry?
    :-)

  4. #4
    Join Date
    Jun 2006
    Posts
    3,861
    Mentioned
    3 Post(s)
    Quoted
    1 Post(s)

    Default

    Inside angle on the top is 22*.

    tan(22) = 20 / x
    0.40403 = 20 / x
    0.40403x = 20
    x = 49.502

    EDIT: Waah, Method winz

  5. #5
    Join Date
    Mar 2007
    Posts
    3,042
    Mentioned
    1 Post(s)
    Quoted
    14 Post(s)

    Default

    He doesn't need to use the law of sines YoHoJo???
    :-)

  6. #6
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Thanks for your guys help, i had no clue ...

  7. #7
    Join Date
    May 2007
    Location
    knoxville
    Posts
    2,873
    Mentioned
    7 Post(s)
    Quoted
    70 Post(s)

    Default

    what do you need trig for? basic algebra could have solved it using pythag.

    e: nvm. 20 is an angle, not a side
    <TViYH> i had a dream about you again awkwardsaw
    Malachi 2:3

  8. #8
    Join Date
    Jun 2006
    Posts
    3,861
    Mentioned
    3 Post(s)
    Quoted
    1 Post(s)

    Default

    Quote Originally Posted by Awkwardsaw View Post
    e: nvm. 20 is an angle, not a side
    No, 20 is a side

  9. #9
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Cause 22 is a angle..

  10. #10
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Ahh you guys ended up doing it wrong, oh well.. My teacher said

    Since the top line and the bottom line of the triangle are parallel, and theres a transveral in the middle of them(making a Z) then the top degree is the EXACT same as the angle of the triangle(bottom left) so the bottom left would be 68 degrees, and then thats how i was supposed to solve .. Oh well, thanks anyway.

  11. #11
    Join Date
    Dec 2007
    Location
    Williston, ND
    Posts
    3,106
    Mentioned
    0 Post(s)
    Quoted
    3 Post(s)

    Default

    well If I would have seen this you would have gotten the right answer
    sorry, lol.
    Proud owner of "Efferator" my totally boted main account!
    "You see, sometimes, science is not a guess" -Xiaobing Zhou (my past physics professor, with heavy Chinese accent)

  12. #12
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Quote Originally Posted by Brain View Post
    well If I would have seen this you would have gotten the right answer
    sorry, lol.
    Lol of course, brain has a big brain

  13. #13
    Join Date
    May 2006
    Location
    Amsterdam
    Posts
    3,620
    Mentioned
    5 Post(s)
    Quoted
    0 Post(s)

    Default

    Quote Originally Posted by Camaro' View Post
    Ahh you guys ended up doing it wrong, oh well.. My teacher said

    Since the top line and the bottom line of the triangle are parallel, and theres a transveral in the middle of them(making a Z) then the top degree is the EXACT same as the angle of the triangle(bottom left) so the bottom left would be 68 degrees, and then thats how i was supposed to solve .. Oh well, thanks anyway.
    Well yes.. But the right top = 90 - 68 = 22 degrees. It really doesn't matter which corner you take
    Either
    Tan(68) = X / 20
    or
    Tan(22) = 20 / x
    Verrekte Koekwous

  14. #14
    Join Date
    Dec 2007
    Location
    Williston, ND
    Posts
    3,106
    Mentioned
    0 Post(s)
    Quoted
    3 Post(s)

    Default

    i didn't even read the thread, tangent works too as the people above explained.
    weird...I hate it when teachers want it done a certain way and ignore right ways that are different...
    Proud owner of "Efferator" my totally boted main account!
    "You see, sometimes, science is not a guess" -Xiaobing Zhou (my past physics professor, with heavy Chinese accent)

  15. #15
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Quote Originally Posted by Brain View Post
    i didn't even read the thread, tangent works too as the people above explained.
    weird...I hate it when teachers want it done a certain way and ignore right ways that are different...
    Tell me about it..

  16. #16
    Join Date
    Mar 2009
    Location
    Ireland
    Posts
    111
    Mentioned
    0 Post(s)
    Quoted
    0 Post(s)

    Default

    Meh, your diagram doesnt show they are parallel.

    line A||B would have done...

    Have have you ever considered it could be the teacher that was wrong?

  17. #17
    Join Date
    May 2007
    Location
    Some where fun.
    Posts
    2,891
    Mentioned
    1 Post(s)
    Quoted
    5 Post(s)

    Default

    Quote Originally Posted by mc_teo View Post
    Meh, your diagram doesnt show they are parallel.

    line A||B would have done...

    Have have you ever considered it could be the teacher that was wrong?
    My diagram isnt exactly parrallel because i used paint.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •