1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding the area of a triangle on a graph

  1. Apr 4, 2013 #1
    Here is the question: http://i259.photobucket.com/albums/hh299/the-real-guitar-hero/Capture_zpsf2b9cd28.png

    part A = 3√5
    b=y=2X+1
    c=(0,1)
    D is where I am confused. Area of triangle = (base x height)/2
    from working out, line 2 cuts the x axis at -1/2. line 1 cuts the x at 7. the height is 3. thus the area should be [(7.5*3)/2] = 11.25 . but the mark scheme says the answer is 7.5????? which is length of the base!!! but the heck???


    This is just one of those small things that has confused the hell out of me >.<
     
  2. jcsd
  3. Apr 4, 2013 #2

    CompuChip

    User Avatar
    Science Advisor
    Homework Helper

    The base of the triangle is PR, which does not have length 7 because P is not on the x-axis!
    Similarly, the height of the triangle is PQ.
     
  4. Apr 4, 2013 #3
    Ugh. ok, so its, 3√5 * √5
     
  5. Apr 5, 2013 #4

    CompuChip

    User Avatar
    Science Advisor
    Homework Helper

    Almost :)

     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Finding the area of a triangle on a graph
  1. Find the area (Replies: 2)

  2. Area of a triangle (Replies: 3)

Loading...