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Math Help - Unit Circle?

  1. September 15th 2008, 12:55 PM #1
    sadieann
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    Question Unit Circle?

    If the point P is on the Unit Circle in Quadrant 3 with x-coordinate , find the y-coordinate.
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  2. September 15th 2008, 12:57 PM #2
    icemanfan
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    The equation for the unit circle centered at the origin is x^2 + y^2 = 1. Substitute in for the value you know and solve for the other.
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