How to combine students' response in Geometry Tool?

Hi, I am trying to create a Geometry activity where students are given a circle and they have to construct a chord and the perpendicular bisector of the chord they have created. I need them to be able to see everyone’s chord and perpendicular bisectors because I want them to observe that the perpendicular bisector always passes through the centre of the circle regardless of where the chord is. How do I combine everyone’s respond on one slide?

I cannot seem to find any documentation on sources or sinks for the Geometry Tool, so getting aggregate to work will be challenging.
I made this with a graph instead.

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Wow! Thank you very much for the help. I am not familiar with computation layer scripts so I will study what you have created and try it out.

Hi Mark , thank you for your help in the question. I would like to seek your permission to use the 2 slides you have created for a blog post I have written to share teaching ideas on Coordinate Geometry of Circles. If you are ok, I will integrate the 2 slides into a DESMOS classroom activity.

Yes, of course!
I would love to read the post. Can you provide a link, either here or via DM?

Thanks Mark!

I will send you the link once it is published.


Start by creating a Google Slides presentation for the activity and share it with your students, granting them editing access. This allows them to contribute to the presentation simultaneously. Instruct your students to create a new slide or use a designated slide to construct their chords and prependicular bisector within the circle. They can drawing tools or shapes available in Google Slides to create their constructions.

Dear Mark

Sorry this took longer. The blog has been published:

Thank you for your help


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