Tim Guindon
LightNews LightNews
banner
tguindon.bsky.social
Tim Guindon
@tguindon.bsky.social
150 followers 110 following 29 posts
Graph Specialist @ Desmos Studio PBC
Former HS Math Teacher
Posts Replies Media Videos
tguindon.bsky.social
I had some fun recreating this visual, with some added interactive elements, in @desmos.com www.desmos.com/calculator/m... #mathsky
November 12, 2025 at 6:04 PM
tguindon.bsky.social
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...
October 27, 2025 at 12:46 PM
tguindon.bsky.social
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.
October 27, 2025 at 12:46 PM
tguindon.bsky.social
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)
October 18, 2025 at 10:12 PM
tguindon.bsky.social
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.
October 10, 2025 at 2:38 PM
tguindon.bsky.social
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...)
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)`.
September 15, 2025 at 2:15 PM
tguindon.bsky.social
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...
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.
September 15, 2025 at 12:57 PM
tguindon.bsky.social
Well that's a walk down memory lane.
List of Desmos saved graphs sorted by edit date, displaying the oldest graphs from November 2012.
September 11, 2025 at 12:40 PM
tguindon.bsky.social
Lovely.
July 11, 2025 at 2:53 PM
tguindon.bsky.social
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...)
May 23, 2025 at 1:25 PM
tguindon.bsky.social
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.
December 13, 2024 at 3:47 PM
tguindon.bsky.social
Looks like rain.
Graph: www.desmos.com/calculator/m...
#mathsky @desmos.com
December 12, 2024 at 1:57 PM
tguindon.bsky.social
Enjoyed re-creating this visual in the @desmos.com Geometry tool: www.desmos.com/geometry/lx7... #mathsky
December 11, 2024 at 8:08 PM
tguindon.bsky.social
Looks like a great option to give the 3D printer a spin!
3D printed model of the Goursat’s Tangle solid, in front of corresponding Desmos graph.
December 11, 2024 at 5:31 PM
tguindon.bsky.social
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.
November 15, 2024 at 3:12 PM
tguindon.bsky.social
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.
October 24, 2023 at 8:11 PM
tguindon.bsky.social
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.
October 18, 2023 at 2:28 PM
tguindon.bsky.social
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.
October 16, 2023 at 7:51 PM
tguindon.bsky.social
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."
October 11, 2023 at 1:41 PM
tguindon.bsky.social
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.
October 6, 2023 at 12:14 PM
tguindon.bsky.social
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
October 5, 2023 at 12:57 PM