Results 1 to 5 of 5

Math Help - Finding an angle within this triangle

  1. #1
    Junior Member
    Joined
    Dec 2009
    Posts
    34

    Finding an angle within this triangle

    Hi,

    All variables given in blue are known values. I am trying to calculate the angle X in terms of the variables I know. How can I do this?

    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,546
    Thanks
    539

    Re: Finding an angle within this triangle

    Hello, Corpsecreate!

    All variables given in blue are known values.
    I am trying to calculate the angle X in terms of the variables I know.


    The sum of the (interior) angles of a triangle is always equal to 180o.

    Hence: . A + B + (C + X) \;=\;180

    Got it?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member
    Joined
    Jun 2009
    Posts
    652
    Thanks
    128

    Re: Finding an angle within this triangle

    You can calculate the angle between the side b and the horizontal, add X to that and you have the angle C.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Dec 2009
    Posts
    34

    Re: Finding an angle within this triangle

    Quote Originally Posted by Soroban View Post
    Hello, Corpsecreate!


    The sum of the (interior) angles of a triangle is always equal to 180o.

    Hence: . A + B + (C + X) \;=\;180

    Got it?
    Angle C is the entire interior angle, not just the angle up to the horizontal. A + B + C will give 180, A + B + (C + X) will give a number larger than 180.

    Quote Originally Posted by BobP View Post
    You can calculate the angle between the side b and the horizontal, add X to that and you have the angle C.
    The angle side b makes with the horizontal is A + phi, I dont see how adding X to this angle would give me angle C?

    NVM: Question has been solved!
    Last edited by Corpsecreate; October 21st 2012 at 10:26 PM. Reason: Problem has been solved.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Super Member
    Joined
    Jun 2009
    Posts
    652
    Thanks
    128

    Re: Finding an angle within this triangle

    The angle side  b makes with the horizontal is A + phi, I dont see how adding X to this angle would give me angle C?
    NVM: Question has been solved!
    The angle referred to is the complement of the one you state, that is, 180 - (A+\phi).

    This will equal the angle below the horizontal at C. Add X and you get C.

    BTW., some labels on the diagram would have helped.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Right angle triangle- finding side
    Posted in the Geometry Forum
    Replies: 1
    Last Post: April 25th 2012, 09:38 PM
  2. Finding the angle measure of a triangle
    Posted in the Geometry Forum
    Replies: 13
    Last Post: August 3rd 2011, 10:02 AM
  3. Replies: 6
    Last Post: June 20th 2011, 04:46 PM
  4. Finding angle of triangle in R3
    Posted in the Geometry Forum
    Replies: 2
    Last Post: September 12th 2010, 05:03 AM
  5. Finding area and angle of triangle
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: December 16th 2009, 09:03 AM

Search Tags


/mathhelpforum @mathhelpforum