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    marium mustafa Posts: 3, Reputation: 1
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    #1

    Sep 30, 2009, 09:18 AM
    Trignometry and bearings
    The point B is 280m due north of point A. A man walks from A in the direction 050(degrees). Calculate how far he has to walk before he is as close as possible to B
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    marium mustafa Posts: 3, Reputation: 1
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    #2

    Sep 30, 2009, 09:41 AM

    (b) as close as possible to B means that the line BD is perpendicular to the 050 bearing line and so AB is a hypotenuse

    So use the basic cosine ratio:

    cos 50 = BD/280

    BD = 280 cos 50

    BD = 179.98

    So after walking for 180 m he is as close to B as he is going to get on the 050 bearing
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