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Math Help - Spherical trigonometry basic

  1. #1
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    Spherical trigonometry basic

    I think this is a fairly easy one. So if someone would give me any hint to the solution to this problem, then I can carry on.

    Problem 1:

    The bearing of B from A is 70 degrees North of East; the bearing of C from B is 60 degrees South of East and the bearing of A from C is 20 degrees South of West. If AB is 10 meters, find the length of BC.

    Thank you very much guys !!
    Last edited by SamanthaMathGirl; December 6th 2010 at 03:24 PM.
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  2. #2
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    Quote Originally Posted by SamanthaMathGirl View Post
    I think this is a fairly easy one. So if someone would give me any hint to the solution to this problem, then I can carry on.

    Problem 1:

    The bearing of B from A is 70 degrees North of East; the bearing of C from B is 60 degrees South of East and the bearing of A from C is 20 degrees South of West. If AB is 10 meters, find the length of BC.

    Thank you very much guys !!
    1. This problem has nothing to do with spherical trig.

    2. Did you make a sketch?

    3. Use the Sine rule to start the calculations.
    Attached Thumbnails Attached Thumbnails Spherical trigonometry basic-bearings_wrt_e.png  
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