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Thread: find tan(angle)

  1. 20th May 2011 08:09 am #1
    kalai
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    Default find tan(angle)

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    how to find tan of angle in lisp
    my code

    tanA= x/y
    i know A and x
    how to get y ?
    help me.
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  2. 20th May 2011 09:46 am #2
    MSasu
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    So, you know the angle and the oposite leg and look for adjacent leg?

    Code:
    (setq theY (/ theX (/ (sin theAngle) (cos theAngle))))
    Regards,
    Mircea
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  3. 20th May 2011 09:51 am #3
    kalai
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    thanks,

    i did try it. but if angle is greater than 90 then how to find y?
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  4. 20th May 2011 09:58 am #4
    MSasu
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    The above trigonometric formula works only in right-angled triangles - for your case need to split your current triangle in right-angled triangles and perform calculations in each to get the appropriate formula.
    Can you post a sketch of your case?

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    Mircea
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  5. 20th May 2011 11:17 am #5
    MSasu
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    Or, if you know the size of triangle's third leg may use the cosine theorem.

    Regards,
    Mircea
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