# Graph Sink with Equation of a Circle

**URL:** <https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312>\
**Category:** Questions\
**Created:** [August 13, 2020, 8:23pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312 "2020-08-13T20:23:28Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Patrick\_Walsh](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/patrick_walsh/32/998_2.png) [@Patrick\_Walsh](https://cl.desmos.com/u/Patrick_Walsh)\
**Post date:** [August 13, 2020, 8:23pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312/1 "2020-08-13T20:23:28Z")

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Hello,

I am trying to design an activity where students have to figure out the equation of a circle that passes through two sets of points. They would input the equation and then it would immediately graph it on the graph next to the input. Then they can click submit or share with class. I am unsure what the correct CL language is.

Basically exactly like this function sink template I found ([Function Sink • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/59d6c6f1f9ead205adc76c27)) but with an equation of a circle instead of an actual function.

I am new to CL and I am only just learning the basics. Any help is appreciated.

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**Author:** ![Erin\_Gray](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/erin_gray/32/921_2.png) [@Erin\_Gray](https://cl.desmos.com/u/Erin_Gray)\
**Post date:** [August 14, 2020, 10:44pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312/2 "2020-08-14T22:44:54Z")

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I may have had that same question - and found a way to do it on the first slide of this activity:

> **[any line two ways • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/5cc38ad7c5edd6679dc15b46)**
>
> by @mrchowmath

And then I used it as part of this activity:

> **[Points, Lines and Circles - HPC @ CA • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/5f36e03c90db5722a3bf0189)**
>
> Develop and formalize the connection between distance and circles.

Hope this helps!

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**Author:** ![FRIEDRICH\_KNAUSS](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/friedrich_knauss/32/528_2.png) [@FRIEDRICH\_KNAUSS](https://cl.desmos.com/u/FRIEDRICH_KNAUSS)\
**Post date:** [August 15, 2020, 1:06pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312/3 "2020-08-15T13:06:24Z")

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Maybe take a look at this?

> **[Building Conic Sections • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/56030ac728462f1706872e72#preview/a43c9ff7-2038-49c4-abe7-72274696eb80)**
>
> In this activity, students explore the connections between algebraic and graphical representations of various conic sections as they work through a series of graphing challenges.
> 
> Translated by the Desmos localization team into:
> French:...

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<div class="post-metadata">

**Author:** ![Patrick\_Walsh](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/patrick_walsh/32/998_2.png) [@Patrick\_Walsh](https://cl.desmos.com/u/Patrick_Walsh)\
**Post date:** [August 15, 2020, 3:06pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312/4 "2020-08-15T15:06:55Z")

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Yes that does the trick. Thanks so much!

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<div class="post-metadata">

**Author:** ![Patrick\_Walsh](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/patrick_walsh/32/998_2.png) [@Patrick\_Walsh](https://cl.desmos.com/u/Patrick_Walsh)\
**Post date:** [August 15, 2020, 3:17pm UTC](https://cl.desmos.com/t/graph-sink-with-equation-of-a-circle/1312/5 "2020-08-15T15:17:44Z")

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Great! Yes that will work as well in my geometry class.