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-   -   Bearing calculation (https://www.askmehelpdesk.com/showthread.php?t=391170)

  • Aug 27, 2009, 05:42 PM
    kookai18
    Bearing calculation
    A ship sails from Port A, 60 nautical miles due west , to a port B . It then proceeds a distance of 50 nautical miles on a bearin of 210 derees to a Port C??

    Find the distance and bearin of C from A...

    Help would be appreciated
  • Aug 27, 2009, 05:45 PM
    s_cianci
    Drawing a sketch will be helpful. Then apply the law of cosines, followed by the law of sines.
  • Aug 27, 2009, 08:24 PM
    kookai18
    I know I've got to use those rules but I'm strugling to draw the sketch... lke how do you draw the bearing of 210
  • Aug 28, 2009, 09:36 AM
    galactus
    1 Attachment(s)
    If you make your sketch, you will see a triangle with angle 120 degrees (90+30 degrees).

    Bearings, in this case, turn clockwise off the positive y-axis. 180 degrees is south, or down the negative y-axis. Then, 30 degrees more.

    That is, if we were to stand and B and face A, then turn 120 degrees to the right we will be facing C.

    One side is length 60 and the other length 50.

    Find the distance from A to C by using the law of cosines.



    Plug in your given values and find AC.

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