Results 1 to 2 of 2

Math Help - coordinate geometry triangle

  1. #1
    Member
    Joined
    Feb 2009
    Posts
    101
    Awards
    1

    coordinate geometry triangle

    2. The points A(-4,10) B(-1,1) and C(2,7) form a triangle

    (a) is this a right angle triangle?

    (b) what is the length of the triangles perimeter?


    any help appreciated
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,830
    Thanks
    123
    Quote Originally Posted by decoy808 View Post
    2. The points A(-4,10) B(-1,1) and C(2,7) form a triangle

    (a) is this a right angle triangle?

    (b) what is the length of the triangles perimeter?


    any help appreciated
    1. Calculate the lengthes of the sides of the triangle using the distance formula.

    2. Check if the Pythagorean theorem is satisfied by the lengthes of the sides.
    Spoiler:
    I've got: |\overline{AB}|=\sqrt{90}, |\overline{AC}|=\sqrt{45}, |\overline{BC}|=\sqrt{45}
    Obviously (\overline{AB})^2 = (\overline{AC})^2 + (\overline{BC})^2
    and therefore the triangle is a right triangle.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. coordinate geometry
    Posted in the Geometry Forum
    Replies: 5
    Last Post: July 10th 2010, 11:18 AM
  2. Replies: 2
    Last Post: July 5th 2010, 06:23 PM
  3. coordinate geometry
    Posted in the Geometry Forum
    Replies: 3
    Last Post: May 27th 2009, 04:19 AM
  4. Coordinate Geometry
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: October 11th 2008, 05:49 AM
  5. Coordinate Geometry
    Posted in the Pre-Calculus Forum
    Replies: 10
    Last Post: May 3rd 2007, 10:09 AM

Search Tags


/mathhelpforum @mathhelpforum