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Math Help - Finding x & y position

  1. #1
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    Finding x & y position

    I'm working on a little html5 canvas experiment and I think my question is best described in an image (not to scale)...

    Finding x & y position-math.png


    I'm fairly certain I need to use trigonometry to solve this.. but I'm I'm not sure how. Please help.
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  2. #2
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    Re: Finding x & y position

    lower left coordinates should be (-20,-200)

    angle between the segment A and the y-axis ...

    \theta = \arctan\left(\frac{1}{10}\right)

    angle between the segment in quad I and the x-axis = 120 - \left[90 + \theta \right] = 30 - \theta

    |A| = \sqrt{20^2 + 200^2}

    x = |A|\cdot \cos(30-\theta)

    y = |A| \cdot \sin(30 - \theta)
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  3. #3
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    Re: Finding x & y position

    wow, thanks skeeter. I think I've got my head around that. I'll have a play and let you know.
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