Results 1 to 5 of 5

Math Help - Word problem plz help!!

  1. #1
    Junior Member
    Joined
    Mar 2008
    Posts
    35

    Word problem plz help!!

    A parallelogram has diagonals of lengths 12 and 15 inches that intersect at an angle of 63.7 degrees. How long are the sides of the parallelogram?

    Has something to do with law of sine...

    2.) Assuming that the circles in the following figure are mutually tangent, find the lengths of the sides and the measures of the angles in triangle ABC. (I have a pic of the problem Thank you for your help?)
    Attached Thumbnails Attached Thumbnails Word problem plz help!!-law-sing.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    Where is triangle ABC?.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Mar 2008
    Posts
    35
    I got it now?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Mar 2008
    Posts
    35
    can someone plz help it's urgent?
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    I think I see now what you're getting at.

    AB=20.62-8.04=12.58, AC=20.62-7.35=13.27, BC=8.04+7.35=15.39

    Now you can use the law of cosines to find angle A:

    A=cos^{-1}\left(\frac{(BC)^{2}-(AC)^{2}-(AB)^{2}}{2(AC)(AB)}\right)

    Sub in your side lengths, then once you have that you can find another by using the law of sines. To find the third just subtract those two from 180.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. word problem - the snow plough problem?
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: October 13th 2011, 01:02 PM
  2. Replies: 3
    Last Post: January 2nd 2011, 08:20 PM
  3. 1 Word problem and 1 function problem
    Posted in the Algebra Forum
    Replies: 8
    Last Post: April 21st 2010, 08:01 AM
  4. Replies: 2
    Last Post: January 10th 2009, 05:49 AM

Search Tags


/mathhelpforum @mathhelpforum