Results 1 to 5 of 5

Math Help - How do you graph a circle with the TI-83 plus calculator?

  1. #1
    Member
    Joined
    Oct 2008
    Posts
    131

    How do you graph a circle with the TI-83 plus calculator?

    The equation is x^2 + y^2 = 9
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member Bacterius's Avatar
    Joined
    Nov 2009
    From
    Wellington
    Posts
    927

    Re: How do you graph a circle with the TI-83 plus calculator?

    There are different ways to do it.

    Cartesian method (y = f(x))

    You will need two functions because of the limitations of the cartesian coordinate system, obtained by rearranging the circle equation in terms of x:

    y = \sqrt{9 - x^2} and y = - \sqrt{9 - x^2}

    Polar method

    This one is simple.. r = 3, since the radius of a circle is constant.

    Parametric method

    Use the trigonometric functions X_t = 3 \cos{(t)} and Y_t = 3 \sin{(t)}.

    You can change the type of graphing method in the setup menu of your TI.
    Last edited by Bacterius; August 7th 2011 at 10:16 PM. Reason: sorry mistake
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Oct 2008
    Posts
    131

    Re: How do you graph a circle with the TI-83 plus calculator?

    What is the preferred method?
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Super Member Bacterius's Avatar
    Joined
    Nov 2009
    From
    Wellington
    Posts
    927

    Re: How do you graph a circle with the TI-83 plus calculator?

    Umm.. whichever, they all produce the same circle. It's up to personal preference and context.

    I would personally recommend the parametric method because it's easy to change the center of the circle if you need to (as well as the radius of course).
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5

    Re: How do you graph a circle with the TI-83 plus calculator?

    Quote Originally Posted by benny92000 View Post
    What is the preferred method?
    The prefered method depends on:

    1. The circumstances.

    2. What you prefer.

    Personally, I don't see why a student would need a calculator to draw the graph of a circle.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: May 6th 2012, 03:16 PM
  2. graphing unit circle on calculator
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: February 18th 2011, 01:46 PM
  3. how to graph functions on a TI-84 calculator
    Posted in the Calculators Forum
    Replies: 2
    Last Post: December 5th 2010, 12:05 PM
  4. Circle Graph
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: June 18th 2008, 02:16 PM

Search Tags


/mathhelpforum @mathhelpforum