iiinova — where your digital self keeps evolving

Reposted by Tim Guindon

Simon Kuestenmacher @simongerman600.bsky.social · 13/07/2026

For the first time, the World Cup final four teams includes only the top 4 teams in FIFA world rankings (1+2+3+4). The combined ranks of the last four teams couldn't be lower (10). In the past, the four last teams have always added up to over 25. HT @chartycharts

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Reposted by Tim Guindon

Mathemagicland @mathemagicland.bsky.social · 06/07/2026

This month I'm running a @desmos.com Notebook challenge to make the best explainer in the new Notebook feature. More details here: youtu.be/x0MYr66AAwM #desmos #math #science #iteachscience #iteachmath

youtu.be

Desmos Notebook Challenge Announcement

YouTube video by Mathemagic Land

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Tim Guindon @tguindon.bsky.social · 17/06/2026

Why yes, I did make a World Cup bracket and group tracker in @desmos.com Notebook. www.desmos.com/notebook/xhh... #worldcup #iteachmath #desmos

desmos.com

World Cup 2026

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Tim Guindon @tguindon.bsky.social · 02/02/2026

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

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Reposted by Tim Guindon

Fabrizio Espindola @fabrizioespindola.bsky.social · 04/12/2025

Look like you missed your graph lesson again! #duolingo

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Tim Guindon @tguindon.bsky.social · 27/10/2025

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

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.

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Tim Guindon @tguindon.bsky.social · 18/10/2025

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)

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Tim Guindon @tguindon.bsky.social · 10/10/2025

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

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

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Tim Guindon @tguindon.bsky.social · 11/09/2025

Well that's a walk down memory lane.

List of Desmos saved graphs sorted by edit date, displaying the oldest graphs from November 2012.

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Reposted by Tim Guindon

Erick Lee @theericklee.bsky.social · 06/06/2025

#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

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Tim Guindon @tguindon.bsky.social · 13/12/2024

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

Checkerboard pattern of teal squares with rounded edges, giving the illusion of fluctuating wave.

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Reposted by Tim Guindon

Howie Hua @howiehua.bsky.social · 12/12/2024

Will this answer surprise you? Or is it intuitive? #math #ITeachMath #EduSky

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Tim Guindon @tguindon.bsky.social · 12/12/2024

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

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Tim Guindon @tguindon.bsky.social · 11/12/2024

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

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Reposted by Tim Guindon

Desmos Studio @desmos.com · 15/11/2024

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

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Tim Guindon @tguindon.bsky.social · 24/10/2023

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

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.

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Tim Guindon @tguindon.bsky.social · 18/10/2023

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

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.

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Tim Guindon @tguindon.bsky.social · 16/10/2023

A delightful Geometry theorem, illustrated using the #Desmos Geometry tool with visual shading and calculations showing the equivalent lengths. #🧮 www.desmos.com/geometry/bpn...

On a circle, points A, B, and C form an arc. Point D is the midpoint of the arc. Segments AB and BC are drawn, and a perpendicular line from point D down to segment AB. Segment AB is shaded blue, and segments EB and BC are shaded orange, demonstrating their equivalence.

Calculation demonstrating that the length of AE is equal to the sum of EB and BC.

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Tim Guindon @tguindon.bsky.social · 11/10/2023

When using custom colors in #Desmos (@desmos.bsky.social), RGB felt straight-forward enough, but I didn't have a clear grasp on what each component of HSV did. Turns out that it's much easier to visualize in 3D. #🧮 #MathSky Graph: desmos.com/3d/180b54127d

A 3D visualization of the HSV color scale of a spherical point changing color as variables for hue, saturation, and value are adjusted. Points form a roughly cylindrical shape where the vertical distance changes the "value", the radius changes the "saturation", and the angle changes the "hue."

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Tim Guindon @tguindon.bsky.social · 06/10/2023

Playing around with the "impossible cube" in Desmos 3D. Graph: www.desmos.com/3d/52f2f13aaa

The "Impossible Cube", a two-dimensional figure that superficially resembles a perspective drawing of a three-dimensional cube, with its features drawn inconsistently from the way they would appear in an actual cube. (from Wikipedia)

The "impossible cube" rotated slightly in 3D space, revealing a disconnect in the front edges of the cube, creating the illusion.

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Tim Guindon @tguindon.bsky.social · 05/10/2023

Seeing lots of Desmos 3D discussion around surfaces of revolution for Calculus. While parametrics are great for showing the act of rotation (see: desmos.com/3d/1a7f86ac77), I'm also loving this strategy, accessible to students who have seen equations of circles before: desmos.com/3d/0439a67934

Screenshot from Desmos 3D, showing a surface of revolution of the function f(x)=2-sin(x) using the expression y^2+z^2=f(x)^2

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