Results 1 to 3 of 3

Math Help - A triangulation help area needed! ASAP

  1. #1
    Newbie
    Joined
    May 2008
    Posts
    2

    A triangulation help area needed! ASAP

    hi thanks for looking at this.

    i have a triangle with angles ABC

    A=57 deegrees
    B=45 deegrees
    C= not given

    and one length between AB of 14metres

    I need to calculate the area within the triangle?

    can someone work it out and show me how?

    thanks

    james
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    Meh
    Posts
    1,630
    Thanks
    6
    Quote Originally Posted by jaynlisa08 View Post
    hi thanks for looking at this.

    i have a triangle with angles ABC

    A=57 deegrees
    B=45 deegrees
    C= not given

    and one length between AB of 14metres

    I need to calculate the area within the triangle?

    can someone work it out and show me how?

    thanks

    james
    No offense, but did you even try attempting this problem?
    It's obvious C = 78 degrees.

    Construct line AM perpendicular to BC.

    Sin(45) = \frac{AM}{AB} = \frac{AM}{14}

    Sin(45) = \frac{ \sqrt{2} }{2}

    AM = 7 \sqrt{2}



    Now use the Sin Rule (Think that's what it's called )

    \frac{Sin C}{c} = \frac{Sin A}{a}

    \frac{Sin \ 78}{14} = \frac{Sin \ 57}{a}

    a = BC = 12,0037


    Now the area is given by:

    \frac{1}{2} \times BC \times AM
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Apr 2008
    Posts
    65
    actually its the sine law
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Math help needed ASAP please
    Posted in the Statistics Forum
    Replies: 24
    Last Post: February 19th 2010, 08:01 AM
  2. [SOLVED] Triangulation help needed
    Posted in the Geometry Forum
    Replies: 1
    Last Post: December 10th 2009, 05:05 AM
  3. HELP NEEDED PLEASE ASAP
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 8th 2008, 02:25 PM
  4. STATS Help Needed ASAP
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: July 21st 2008, 11:45 PM
  5. Surds Help needed ASAP
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 4th 2008, 05:37 PM

Search Tags


/mathhelpforum @mathhelpforum