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Math Help - How do I figure out this angle?

  1. #1
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    How do I figure out this angle?

    Okay, well I have 2 fingers on an iPhone. The finger higher up will be called, "finger 2", where-as the finger lower down will be known as, "finger 1". Now suppose I were to take the x value of finger 2 along with the y value of finger 1 and create a third point called, "point 3" I would now have 3 points and an imaginary if you well, right triangle.
    I want to find the angle of the intersection of line segment (point 3, finger 1) and line segment (finger 1, finger 2)... I want to find the angle of the intersection at the point, finger 1.
    Also it needs to be in radians. What do I do to solve this, it has been ages since I've done trigonometry.

    Diagram attached: How do I figure out this angle?-diagram1.png.

    In your equations to make things simpler we will define the following variables:
    X1 = The x-value of finger 1.
    Y1 = The y-value of finger 1.
    X2 = The x-value of finger 2.
    Y2 = The y-value of finger 2.
    X3 = The x-value of point 3.
    Y3 = The y-value of point 3.
    Angle1 = The angle we are solving for.

    Thank-you very much!
    Last edited by orange gold; July 2nd 2010 at 02:08 AM.
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  2. #2
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  3. #3
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    Quote Originally Posted by orange gold View Post
    What do I do to solve this, it has been ages since I've done chemistry.
    I didn't see this as a chemistry question.

    Firstly take the advice from post #2


    Quote Originally Posted by orange gold View Post
    Also it needs to be in radians.
    For conversion to radians recall

    1^{\circ} = \frac{\pi^{c}}{180}
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  4. #4
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    x = distance of line segment finger2, point3
    y = distance of line segment finger1, point3
    and then I take:
    tan-1(x/y)
    so
    n = atan(x/y)
    pi/n = the angle in radians?
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