Tim Guindon

Promotional graphic for the NCTM Spring Conference 2026 in Indianapolis (February 11–13). The background is blue with the large text “I’M PRESENTING!” and the word “INDY” spelled using photo cutouts. The photos show educators at a conference: one person smiling and flashing peace signs at a table, two people collaborating over a large sheet of paper, a woman listening attentively during a session, and a crowd of conference attendees walking through an exhibit hall. The NCTM logo and Spring Conference branding appear at the top.

I’m excited to represent @desmos.com at the @nctm.org #NCTMINDY26 Spring Conference, February 11-13, in Indianapolis!
It's always a pleasure to talk math with educators, and I get the added bonus of sharing about Desmos & the power of dynamic geometry software. nctm.org/indianapolis2026
#iteachmath

Look like you missed your graph lesson again!

#duolingo

I had some fun recreating this visual, with some added interactive elements, in @desmos.com www.desmos.com/calculator/m... #mathsky

Naturally, I couldn't resist recreating this visualization in @desmos.com. It was a lot of fun chatting with Mike and the other attendees after the session, talking about my go-to Desmos strategies and the pros and cons of different instructional resources.
Graph link: www.desmos.com/calculator/j...

A wooden board, approximately 1.5x2.5 feet, painted blue with carved tracks in the shape of a circle with concentric rings, and long horizontal lines extending out from the circle rings. The presenter is shown starting to drag a thin metal chain along one of the tracks from the circular ring down to the straight path.

One of the highlights of OCTM this past week was attending Mike Browne's session on "Introducing Students to Calculus" where he shared this delightful visual that he constructed of unwrapping the area of a circle into a triangle. #octmconnects #ohioctm

Desmos Dynamic Geometry - Agenda & Resources - NCTM 2025 Is That True for EVERY Triangle? Applying the Power of Dynamic Geometry Software NCTM Annual Conference 2025 Agenda Link: bit.ly/DesmosNCTM25-Agenda Slides Link: bit.ly/DesmosNCTM25-Slides Agenda:...

It was a quick overview session introducing the tool, but you can find my agenda with links to other resources here: bit.ly/DesmosNCTM25...

It’s a great feature request! Will be bringing that one back to the team.

Trace a Point Using Ticker

Prompted by some fun discussions during the session, I’ve been playing around with different strategies for “tracing a point” in Desmos: www.desmos.com/geometry/ggm...
#iteachmath

It was a great way to wrap up the @nctm.org Annual Meeting presenting on Geometry in @desmos.com. Looking forward to sharing again next week back in Ohio at OCTM!
(For those curious, the slide in the picture was not about Geometry…we got off on a tangent looking at some example graphs)

NCTM branded "I'm speaking!" promotional card for the 2025 Annual Meeting & Exposition, Oct. 15-18, Atlanta.

Excited to head to Atlanta next week for the @nctm.org Annual Meeting!
I'll be representing @desmos.com with a session on dynamic geometry software on Saturday. I’m putting together my agenda of sessions to attend — any recommendations? #iteachmath

A multi-color star design in the Desmos graphing calculator formed by 4 different triangles, defined in the expression list in the form of `polygon(x1,y1)`.

Oh yea, definitely some different on-ramps depending on where kids are coming into it. Could be converted into smaller bite-size triangles to re-create using rectangular coordinates to start, but you know what would work best for your students. (Updated graph: www.desmos.com/calculator/h...)

Blue star pattern designed in the Desmos graphing calculator by rotating equilateral triangles in 30 degree increments around the origin.

Purple star pattern designed in the Desmos graphing calculator by rotating right triangles in 30 degree increments around the origin.

Love this concept, and the 3D printing potential is amazing. Maybe experiment with starting with triangle polygons plotted using different points, but then rotating them into a pattern?
Graph: www.desmos.com/calculator/h...

Well that's a walk down memory lane.

Lovely.

Student generated Reimondrian art

Student generated Reimondrian art

Student generated Reimondrian art

#MathArt project in calculus class today. Students generated "Reimondrian" art in @desmos.com. (Inspired by @mathzorro.bsky.social). Reimondrian is a mash up of Reimann sums and Piet Mondrian art. Some very creative students. #ITeachMath #MathsToday

That was great to see! I was pulling for you, along with the rest of the Toffee supporters apparently. (from www.reddit.com/r/Everton/co...)

Spinning Parametric Paths

I'm not going to venture to solve it directly, but this made me recall this visualization I had worked up at some point: www.desmos.com/3d/7239a9576c

Loving these trippy geometric patterns, and couldn't resist recreating these delightful squircles in @desmos.com www.desmos.com/calculator/p...

Will this answer surprise you? Or is it intuitive?

#math #ITeachMath #EduSky

Looks like rain.
Graph: www.desmos.com/calculator/m...
#mathsky @desmos.com

Enjoyed re-creating this visual in the @desmos.com Geometry tool: www.desmos.com/geometry/lx7... #mathsky

3D printed model of the Goursat’s Tangle solid, in front of corresponding Desmos graph.

Looks like a great option to give the 3D printer a spin!

It's here.✨
Head to desmos.com/art to learn more, and be sure to submit your graphs by January 15th, 2025!
#MathSky #iTeachMath #iTeachPhysics #mathart #desmosart

Love this visual. You could do a gradual reveal using a slider, or toggle over to translucent surfaces (I know, not solids yet 🙃) to see through the outer cylinders.

So exciting - congrats, Jenny!

Some great strategies here for getting started with #Desmos #Geometry @desmos.bsky.social #MathSky #iTeachMath

Right? Loved the elegance of it.

Regular pentagon inscribed in a circle with chords connecting one vertex to all the others, and lengths whose product is equal to 5.

Regular dodecagon inscribed in a circle with chords connecting one vertex to all the others, and lengths whose product is equal to 5.

Fun one to visualize in #Desmos #Geometry - Given a regular n-gon inscribed in a unit circle, the product of the chords from one vertex of the polygon to all the others is equal to n. www.desmos.com/geometry/pb3...
Inspiration from this delightful poster: diffgeom.com/products/pro...
#MathSky

Totally agree on the GIFs. Delightful graphs, though!

Spiraling 3D surface, increasing up the z-axis. Color shading from blue out to pink.

Spiraling 3D surface, increasing up the z-axis. Color shading from green out to blue.

Spiraling 3D surface, increasing up the z-axis. Color shading from red out to green.

Some therapeutic spirals in #Desmos 3D.
www.desmos.com/3d/0bdf71e576