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Math Help - Trigonometry-quetion of method

  1. #1
    Member Mr Rayon's Avatar
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    Exclamation Trigonometry-quetion of method

    When ever we are trying to find an unknown angle of a right-agled triangle we use trigonometry eg.

    sin angle a=8/14
    =0.571428571
    sin-10.57148571
    =34.84990455

    And at this point I am not sure whether it is mandatory to round it to two decimal places eg. in this problem it would become 34.85; and then find the degrees, minutes and seconds or do we just leave it as it is then find the degrees, minutes, seconds?

    I am concerned about this because I am not sure how problems such as this will be solved or corrected under test conditions. All help is appreciated...thx
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Mr Rayon View Post
    When ever we are trying to find an unknown angle of a right-agled triangle we use trigonometry eg.

    sin angle a=8/14
    =0.571428571
    sin-10.57148571
    =34.84990455

    And at this point I am not sure whether it is mandatory to round it to two decimal places eg. in this problem it would become 34.85; and then find the degrees, minutes and seconds or do we just leave it as it is then find the degrees, minutes, seconds?

    I am concerned about this because I am not sure how problems such as this will be solved or corrected under test conditions. All help is appreciated...thx
    If you are going to break it down to degrees, minutes, and seconds then don't round it before you do that. Rounding before you split the angle will give you errors in your final answer. Round after you have done this procedure.

    For example,
    34.849904579046^o = 34^o~50'~59.66"
    and
    34.85^o = 34^o~51'

    Close, but not quite the same.

    -Dan
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  3. #3
    Member Mr Rayon's Avatar
    Joined
    Sep 2007
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    Thumbs up Conclusion

    Thought that was the right thing to do...thanks for the confirmation. I'm afraid my math textbook was to blame for my doubt.
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