Results 1 to 3 of 3

Math Help - trig triangle problem

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    61

    trig triangle problem

    Hi, there is this one problem I have and five continuations of it. I can't figure out the first problem, meaning I can't figure out the continuations. Could someone help me? And quickly preferably so I can finish my math hw? =(



    The figure shows a long rectangular strip of paper, one corner of which has been folded over to meet the opposite edge, thereby creating a 30 degree angle. Given that the width of the strip is 12 inches, find the length of the crease.

    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Sep 2008
    Posts
    61
    Please, this is really important. i still haven't figured it out and I need this to complete the REST of my homework!
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,698
    Thanks
    1514
    Quote Originally Posted by pyrosilver View Post
    Please, this is really important. i still haven't figured it out and I need this to complete the REST of my homework!
    There's not enough information.

    The answer depends on how much of the width remains after the fold.

    Call that remaining width x.

    Then the amount of the width that has been folded is 12 - x.

    This is the opposite side of a right angled triangle with 30 degrees as its angle. We're trying to find the hypotenuse, so we use the sine ratio.

    \sin{30^\circ} = \frac{12 - x}{H}

    \frac{1}{2} = \frac{12 - x}{H}

    2 = \frac{H}{12 - x}

    H = 2(12 - x).
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trig triangle word problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: November 17th 2010, 10:46 PM
  2. Help with trig problem. (solving right triangle)
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: May 29th 2010, 05:15 PM
  3. Trig triangle problem
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: May 23rd 2010, 10:17 PM
  4. triangle trig problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: August 21st 2009, 08:44 AM
  5. Right Triangle Trig word problem
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: April 6th 2009, 07:52 PM

Search Tags


/mathhelpforum @mathhelpforum