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Math Help - Question relating to the Unit Circle.

  1. #1
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    Question relating to the Unit Circle.

    This is a question from the homework:

    "The terminal arm of an angle theta lies in Quadrant IV on the line with equation 5x + 12y = 0. Determine the value of each trigonometric function."

    I was asked to do B), which is:

    B) cos theta

    How do I solve this?

    Thanks
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  2. #2
    Junior Member Spimon's Avatar
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    I've never seen a question like this before, but from my interpretation it sounds like it wants you to find the Cosine of the angle formed by the line given by that equation.
    As this is a straight line, you can find a single point on the line by solving for x (or y) and giving that unknown a value and in turn, finding the value of the other unknown.
    Maybe the picture below will explain it better.

    [/IMG]
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  3. #3
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    Thanks.
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