Results 1 to 2 of 2

Thread: Parallelogram Problems

  1. #1
    Newbie
    Joined
    Oct 2008
    Posts
    5

    Exclamation Parallelogram Problems

    In a parallelogram ABCD, AB=15 cm and BC = 14cm. The foot H of the perpendicular dropped from Bto ADis between A and D. Find the length of the diagonal BD if BH= 12cm,

    I will be amazed at whoever can do this

    thanks-a-million
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Apr 2005
    Posts
    1,631
    Quote Originally Posted by googa View Post
    In a parallelogram ABCD, AB=15 cm and BC = 14cm. The foot H of the perpendicular dropped from Bto ADis between A and D. Find the length of the diagonal BD if BH= 12cm,

    I will be amazed at whoever can do this

    thanks-a-million
    In the right triangle BHA:
    By Pythagorean theorem,
    AH = sqrt(15^2 -12^2) = sqrt(81) = 9 cm

    So, in the right triangle BHD:
    HD = 14 -9 = 5 cm
    Thus,
    BD = sqrt(5^2 +12^2) = sqrt(169) = 13 cm ----------answer
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Parallelogram
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: Nov 8th 2009, 02:01 PM
  2. Parallelogram
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: Nov 18th 2008, 04:01 PM
  3. PARALLELOGRAM
    Posted in the Geometry Forum
    Replies: 2
    Last Post: Oct 5th 2008, 05:39 PM
  4. parallelogram
    Posted in the Geometry Forum
    Replies: 4
    Last Post: Apr 9th 2008, 09:44 AM
  5. Parallelogram Help
    Posted in the Geometry Forum
    Replies: 3
    Last Post: May 1st 2007, 11:19 AM

Search Tags


/mathhelpforum @mathhelpforum