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Math Help - Finding Theta?

  1. #1
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    Question Finding Theta?

    If the inital side of is along the positive x-axis and the terminal side includes the point P given below, find in radians:

    (a) , =?
    (b) , ?
    (c) , ?
    (d) , ?
    (e) , ?
    (f) , ?
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  2. #2
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    When calculating the value of theta, you begin with the positive x-axis and move counterclockwise. If you know a little bit of trigonometry, these are all straightforward. Recall that cos \frac{\pi}{4} = sin \frac{\pi}{4} = \frac{\sqrt{2}}{2}, and the identities cos x = - cos (\pi - x), sin x = sin(\pi - x).
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  3. #3
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    Most of those answers are some form of \frac{\pi}{2} \mbox{ or } \frac{\pi}{4}.
    For example b. is \frac{3\pi}{4}.
    You show us some work on the others.
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