The equation is x^2 + y^2 = 9

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- August 7th 2011, 09:19 PMbenny92000How do you graph a circle with the TI-83 plus calculator?
The equation is x^2 + y^2 = 9

- August 7th 2011, 09:56 PMBacteriusRe: 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:

and

**Polar method**

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

**Parametric method**

Use the trigonometric functions and .

You can change the type of graphing method in the setup menu of your TI. - August 8th 2011, 12:15 AMbenny92000Re: How do you graph a circle with the TI-83 plus calculator?
What is the preferred method?

- August 8th 2011, 12:23 AMBacteriusRe: 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). - August 8th 2011, 12:24 AMmr fantasticRe: How do you graph a circle with the TI-83 plus calculator?