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Math Help - confused with angles

  1. #1
    Junior Member
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    confused with angles

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    Last edited by yzc717; September 28th 2008 at 02:09 AM.
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  2. #2
    Junior Member
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    Mesnil, Mauritius
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    (b)
    Without calculations, since the three vectors have magnitude 3.00, you can deduce that the three angles will be 60 degrees each.

    However, you also know that since B points downwards, it goes beyond the x-axis. Since the angle at the origin is 60 degrees and the angle that A makes with the positive direction of the x-axis is 30 degrees, you can deduce that the angle that the resultant makes with the positive direction of the x-axis is (60-30) degrees = 30 degrees.

    You get me here?

    Now, if you move the resultant to the origin, you will notice that the origin makes an angle of (180-30) degrees = 150 degrees with the +ve direction of the x-axis.

    Since the question asks you to report all angles counterclockwise from the positive x axis, you simply start from the x-axis, and move counterclockwise until you reach your resultant.

    The answer is 150 degrees.
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