Results 1 to 4 of 4

Thread: Perimeter of a Triangle using Cartesian coordinates

  1. #1
    Newbie
    Joined
    Apr 2017
    From
    OH
    Posts
    2

    Perimeter of a Triangle using Cartesian coordinates

    Hi: I am trying to solve finding the equation of an Incenter of a triangle and the InRadius. I am stuck on the idea of finding the side lengths if I am using a Cartesian coordinate system, the triangle is either acute or scalene . Any help is appreciated!



    Perimeter of a Triangle using Cartesian coordinates-triangle-cart.jpg
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Apr 2005
    Posts
    19,174
    Thanks
    2815

    Re: Perimeter of a Triangle using Cartesian coordinates

    If the problem is "find the perimeter" just find the lengths of the three sides and add them! The distance from (x_0, y_0) to (x_1, y_1) is \sqrt{(x_1- x_0)^2+ (y_1- y_0)^2}. You are given the coordinates of the three points. Find those three distances and add.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Feb 2015
    From
    Ottawa Ontario
    Posts
    1,645
    Thanks
    308

    Re: Perimeter of a Triangle using Cartesian coordinates

    Quote Originally Posted by pbayer View Post
    Hi: I am trying to solve finding the equation of an Incenter of a triangle and the InRadius. I am stuck on the idea of finding the side lengths if I am using a Cartesian coordinate system...
    You are trying to find the Incenter and Inradius,
    and don't know how to find side lengths?
    That's a bit like trying to cook and not knowing how to turn on the stove

    Also, your diagram is faulty (if in 1st quadrant as the coordinates suggest).

    I suggest the following:
    1: change your labelling from 1,2,3 to A,B,C respectively
    2: get some graph paper and plot your triangle correctly
    3: come back with a new/correct diagram
    4: show your work
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Apr 2017
    From
    OH
    Posts
    2

    Re: Perimeter of a Triangle using Cartesian coordinates

    Thanks for the equation, I programmed it into C++ and it worked great!

    Unfortunately I suffered a traumatic brain injury from an autoimmune disease so my logic is often faulty .
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Polar coordinates to Cartesian coordinates
    Posted in the Differential Equations Forum
    Replies: 4
    Last Post: Mar 12th 2016, 06:08 AM
  2. Replies: 10
    Last Post: Sep 24th 2010, 04:33 AM
  3. Replies: 6
    Last Post: Aug 30th 2010, 03:34 PM
  4. Covert Cartesian coordinates eq. into Cylindrical coordinates
    Posted in the Differential Geometry Forum
    Replies: 0
    Last Post: Aug 6th 2010, 06:56 AM
  5. cartesian coordinates
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: Oct 25th 2009, 04:01 PM

Search tags for this page

Click on a term to search for related topics.

/mathhelpforum @mathhelpforum