1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Trig proof

  1. Mar 23, 2005 #1
    I have to prove that [itex]a/\sin\alpha =b/\sin\beta[/itex]. A triangle has sides "a", "b", "c" and angles [itex]\alpha[/itex] and [itex]\beta[/itex] (opposite of the sides "a" and "b" respectively).

    This is what I did:

    Draw a line "h" as the height of the triangle on the side "c".

    [tex]\sin\alpha = h/b[/tex]. Multiplying by "b" gives [tex]b\sin\alpha = h[/tex]

    [tex]\sin\beta = h/a[/tex]. Multiplying by "a" gives [tex]a\sin\beta = h[/tex]

    From this we see that [tex]b\sin\alpha = a\sin\beta[/tex] and from this


    - Kamataata
  2. jcsd
  3. Mar 23, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    It looks okay to me...:smile:

  4. Mar 23, 2005 #3
    Thanks for the quick help!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook