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Math Help - [SOLVED] trignometry

  1. #1
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    [SOLVED] trignometry

    hi! can't understand what does "bearing of 325 degrees" in trigo means.
    For example take this problem of 10th standard of IGCSE board-
    Two boats set off from X at the same time.Boat A sets off on a bearing of 325 degrees and with a velocity of 14kmperhour.Boat B sets off on a bearing of 235 degrees with a velocity of 18kmper hour.Calculate the distance between the boats after 2.5 hours
    kindly explain how to get the triangle when bearing in degrees is given.
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  2. #2
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    A bearing like that is technically an azimuth. It is turned clockwise from north or the positive y-axis right around the circle.

    325-235=90, so you have a right triangle which is easy to work with.

    Boat A travels 14*2.5=35 km

    Boat B travels 18*2.5=45 km.

    So you have two sides of length 35 and 45 and a 90 degree angle.

    All you need is Pythagoras.
    Last edited by galactus; November 24th 2008 at 06:38 AM.
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  3. #3
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    thankyou

    thanks a lot
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