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Math Help - problem solving basic tan equation!

  1. #1
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    problem solving basic tan equation!

    Hi all,

    I have an equation which I cannot solve. I have the values and the answer, but I am unable to recreate it myself. Any help would be appreciated as I need to apply this to my own numbers....

    To calculate an angle (A) = tanH/(D-d)

    Where H=1.5, D= 2.5 and d=0.5. The answer I have been given is 56 degrees.

    I have tried every combination of things and am getting nowhere in recreating the answer, can someone tell me what I am doing wrong?

    Thanks in advance,
    E
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  2. #2
    MHF Contributor Siron's Avatar
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    Re: problem solving basic tan equation!

    Imo the question is not clear.
    Is the equation:
    A=\frac{\tan(H)}{D-d}
    ?
    If you know H,D,d then you can enter them in the given equation.
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  3. #3
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    Re: problem solving basic tan equation!

    I don't know, the equation posted is exactly how it is written in the article I got it from. However, as I said, I have tried different combinations and still am not getting the answer (including from your suggestion).

    Perhaps I need a step by step - calculator-type instruction because I must be missing something somewhere for it not to work...
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  4. #4
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    e^(i*pi)'s Avatar
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    Re: problem solving basic tan equation!

    Code:
    tan ( 1 . 5) / (2 . 5 - 0 . 5 )
    Some calculators demand the argument of the tan first so in that case do 1.5 tan

    That being said I get an answer of A = 0.0131 (3sf)


    What are your units? As it stands tan(H) is dimensionless so what are D and d
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  5. #5
    MHF Contributor Siron's Avatar
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    Re: problem solving basic tan equation!

    I suppose the given information H,D,d are in radians ...
    I would say:
    A=\tan\left(\frac{1,5}{2}\right) \Leftrightarrow A\approx 0,9316 \mbox{rad}\approx 53,37
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  6. #6
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    Re: problem solving basic tan equation!

    The dimensions of H, D and d are all in km.
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