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Homework Help: Proof on angles.

  1. Dec 23, 2013 #1
    http://postimg.org/image/3mmlbro1p/ [Broken]
    Hi, I just want to know if my proof seems ok.

    So we can begin with :

    1 degrees = 1+1/9 grads

    we multiply by x to generalize

    x degrees= x+x/9 grads

    now, we take x degrees and multiply it by 60 minutes to know how many minutes it makes.We also do the same with x+x/9 grads but we multiply it by a 100 minutes. After, we put this form :

    60x degrees/(100x+100x/9) grads

    we simplify it :


    60x * 9/1000x

    We cancel and simplify


    Which finally gives us 27/50 for any 'x'.

    Does this seem correct ? Thank you !
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Dec 23, 2013 #2
    That seems to work. You can simplify the process by a few steps by doing

    ##\displaystyle\frac{60(x-\frac{x}{10})}{100(x)}## instead.
  4. Dec 23, 2013 #3


    Staff: Mentor

    It's a bad idea to use mixed numbers like 1 + 1/9, because it makes the calculations more difficult.

    1 deg. = 10/9 grads
    x deg. = (10/9)x grads
    Last edited by a moderator: May 6, 2017
  5. Dec 23, 2013 #4
    Ok, thanks for the info !
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