Results 1 to 3 of 3

Math Help - trigo problem no. 9

  1. #1
    Member
    Joined
    Sep 2007
    Posts
    176

    trigo problem no. 9

    trigo problem no. 9
    p148 q8

    How to do [b]? thanks
    Attached Thumbnails Attached Thumbnails trigo problem no. 9-out0038.jpeg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by afeasfaerw23231233 View Post
    trigo problem no. 9
    p148 q8

    How to do [b]? thanks
    Actually this one's quite annoying me.

    I can see a brutal approach - but I'm sure there's a simple approach based on a cyclic quadrilateral theorem (so that there's a point to part (a)) ..... Probably a theorem dealing with the case of one of the diagonals being a diameter of the circle that would lead to something along the lines of LM = RQ \sin \alpha ... perhaps a special case that follows from Ptolemy's Theorem ....... Nothing I could find using google - I'll probably end up proving (or disproving) what I want myself .....
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2007
    Posts
    176
    thanks! my textbook mentioned it before, but i forget it.
    for any triangle, a/sinA = b/sinB = c/sinC = 2R, where R is the radius of the circle, providing that point ABC are concyclic. here's textbook's content about the sine law.
    but what is Ptolemy's Theorem? i didn't learn it before
    Attached Thumbnails Attached Thumbnails trigo problem no. 9-untitled.jpeg  
    Last edited by afeasfaerw23231233; January 27th 2008 at 11:19 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. trigo problem
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: October 23rd 2011, 08:43 AM
  2. trigo problem
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: December 24th 2009, 07:08 AM
  3. trigo problem no. 21
    Posted in the Trigonometry Forum
    Replies: 0
    Last Post: March 8th 2008, 07:44 AM
  4. trigo problem no. 14
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: February 9th 2008, 12:12 AM
  5. trigo problem no. 11
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: January 31st 2008, 06:41 AM

Search Tags


/mathhelpforum @mathhelpforum