Results 1 to 6 of 6
Like Tree1Thanks
  • 1 Post By Shakarri

Math Help - Seemingly flawed algebra

  1. #1
    Senior Member Paze's Avatar
    Joined
    Nov 2012
    From
    Iceland
    Posts
    379
    Thanks
    19

    Seemingly flawed algebra

    Riddle me this MHF.

    How come the algebra doesn't provide me with two solutions?

    (SinX = SinB and 49 is 49. This was sketched in a hurry..More like doodled..)

    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Oct 2012
    From
    Ireland
    Posts
    607
    Thanks
    168

    Re: Seemingly flawed algebra

    Quote Originally Posted by Paze View Post
    Riddle me this MHF.

    This was sketched in a hurry..More like doodled..)
    I'd suggest using a ruler next time

    What about B and B+450
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Senior Member Paze's Avatar
    Joined
    Nov 2012
    From
    Iceland
    Posts
    379
    Thanks
    19

    Re: Seemingly flawed algebra

    Quote Originally Posted by Shakarri View Post
    I'd suggest using a ruler next time

    What about B and B+450
    Yes, but the general idea should be obvious. I have two triangles with 2 identical sides and 1 identical corner. That means that I have a different corner B in each triangle but solving with algebra only yields one solution. I am supposed to somehow 'know' to subtract the 2nd solution from 180 to get my 2nd corner and we all know that that's not how mathematics work. There is a reason and I would very much like to know it.

    The rest of your answer I do not understand...B and B+450..?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member
    Joined
    Oct 2012
    From
    Ireland
    Posts
    607
    Thanks
    168

    Re: Seemingly flawed algebra

    Quote Originally Posted by Paze View Post
    The rest of your answer I do not understand...B and B+450..?
    Normally when people say "riddle me this" they mean the question as a joke so I gave a non serious answer.
    sin(B)=sin(B+90)=sin(B+450)
    Last edited by Shakarri; March 19th 2013 at 08:31 PM.
    Thanks from Paze
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Senior Member Paze's Avatar
    Joined
    Nov 2012
    From
    Iceland
    Posts
    379
    Thanks
    19

    Re: Seemingly flawed algebra

    Quote Originally Posted by Shakarri View Post
    Normally when people say "riddle me this" they mean the question as a joke so I gave a non serious answer. I think that the angle in the second triangle is B+90 since sin(B)=sin(B+90)=sin(B+450).
    Oh you answered my question indirectly.

    It's because sin(180-B)=sin(b).
    (Not b+90)


    Thanks!
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Super Member
    Joined
    Oct 2012
    From
    Ireland
    Posts
    607
    Thanks
    168

    Re: Seemingly flawed algebra

    Oops that was silly of me. I tried sketching it and got 105 and 75
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: May 4th 2010, 11:19 AM
  2. Flawed Knowledge of Reduction Formulas
    Posted in the Calculus Forum
    Replies: 1
    Last Post: January 26th 2010, 07:23 PM
  3. Seemingly Easy??
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: December 11th 2009, 06:40 AM
  4. Seemingly Easy??
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: December 10th 2009, 01:30 PM
  5. Is this question flawed?
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: November 21st 2008, 12:48 PM

Search Tags


/mathhelpforum @mathhelpforum