Results 1 to 2 of 2

Math Help - ABC the Triangle (urgent)

  1. #1
    Newbie
    Joined
    Jun 2009
    Posts
    9

    Exclamation ABC the Triangle (urgent)

    let ABC be a triangle with AB=AC. D is a point on AC such that BC=BD. E is a point on AB such that BE=ED=AD. Find the angle size of EAD

    please someone help, and also if u can show some working out that wouldbe great

    thnx a million
    justanotherperson
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Grandad's Avatar
    Joined
    Dec 2008
    From
    South Coast of England
    Posts
    2,570
    Thanks
    1

    Isosceles triangles

    Hello justanotherperson
    Quote Originally Posted by justanotherperson View Post
    let ABC be a triangle with AB=AC. D is a point on AC such that BC=BD. E is a point on AB such that BE=ED=AD. Find the angle size of EAD

    please someone help, and also if u can show some working out that wouldbe great

    thnx a million
    justanotherperson
    Look at the diagram I've attached, which shows all the equal angles in the various isosceles triangles.

    In \triangle ABC: 2x+z = 180

    In \triangle BDC: 2x + (x-y) = 180

    In \triangle EBD: 2y + (180 - z) = 180

    Solve these equations to find the value of z\,\, ( = \angle EAD)

    I make it: x = 67\tfrac12^o, y = 22\tfrac12^o, z = 45^o.

    Can you see how to get these answers?

    Grandad
    Attached Thumbnails Attached Thumbnails ABC the Triangle (urgent)-untitled.jpg  
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. urgent triangle help!
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: December 13th 2008, 12:52 PM
  2. Replies: 6
    Last Post: October 19th 2008, 07:00 AM
  3. Replies: 7
    Last Post: May 23rd 2008, 06:25 AM
  4. Replies: 27
    Last Post: April 27th 2008, 10:36 AM
  5. Triangle - Urgent
    Posted in the Geometry Forum
    Replies: 1
    Last Post: August 2nd 2007, 02:11 AM

Search Tags


/mathhelpforum @mathhelpforum