Results 1 to 2 of 2

Thread: Bearings help

  1. #1
    Newbie
    Joined
    Apr 2018
    From
    byron bay
    Posts
    1

    Bearings help

    i'm having trouble with this question and am unsure how to do it
    A triangular field
    ABC has sidesAB = 85 m and AC = 50 m. If B ison a bearing of 065c from A andC is on a bearing of 166c from A,find the length of BC, correct tothe nearest metre.



    the answer in the back of the textbook is 107m
    Please help!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Newbie
    Joined
    Apr 2018
    From
    GB
    Posts
    6

    Re: Bearings help

    Try finding angle A using the given bearings (A=166-65=101), then apply the Cosine rule.
    BC²=AB²+AC² - 2.AB.AC. Cos A
    BC²=11,346.876…
    BC=106.5217…=107m
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. bearings
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: Dec 7th 2009, 10:20 PM
  2. Bearings! please help!
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: May 1st 2009, 11:09 AM
  3. Bearings
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: Apr 27th 2009, 02:52 PM
  4. Bearings Help
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: Mar 22nd 2008, 06:54 AM
  5. bearings
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: Oct 17th 2007, 08:04 PM

/mathhelpforum @mathhelpforum