Barney Maunder-Taylor says a square-based pyramid is exactly twice the volume of a triangular-based one (same side length). He doesn't want the tedious trig approach to proving it though, he wants a more intuitive route. He'll try the usual proof by @geogebra.org instead #mathsjam

📣 We’re excited to welcome you to the newly formed Association for Mathematics in Education! After bringing together five long-standing associations, we’re proud to unite our communities, expertise, and energy under our new association. Watch our welcome video: www.youtube.com/watch?v=1uLL...

We’re looking forward to seeing everyone at MathsJam Gathering this weekend - follow along here to see what people are sharing, and use #mathsjam to share your favourite moments!

After some confusing back and forth interactions, I've realized that "I moved the meeting back by 30 min" is interpretable as both: - "moved earlier by 30 min", and - "moved later by 30 min"

If anyone wants to try printing this and testing it in the real world, the model here might be more suitable: it has slightly rounded edges, and the faces are slightly inset to give more clearance when assembling it. https://skfb.ly/pzDKY

I spent hours yesterday (on a long plane journey) failing to solve Stewart Coffin's Four Fit puzzle. I tried everything I could think of, and nothing worked. If you know the solution please don't tell me.

// Here is some OpenSCAD code, if you want to understand how I made it, or to make your own: r = 10; h = 60; module hex_prism(i) { rotate([acos(1/sqrt(3)), 0, i * 90]) linear_extrude(height = h, center=true) circle(r, $fn=6); } for(i=[0 : 1 : 3]) for(j=[i + 1 : 1 : 3]) for(k=[j + 1 : 1 : 3]) […]

The first prototype came out better than I expected, though there's a lot of room for improvement still.

A noperthedron container printed! #mathart #mtbos #noperthedron #polyhedra

I am printing a noperthedron pencil holder :) #mtbos #mathart #noperthedron

Patrons de pyramides "coupées" par un plan. #geogebra : www.geogebra.org/m/kjmjkmkj #math #pyramid #net #geometry #patron

- Tu sais utiliser Geogebra ? - Oui, bien sur. Je l'utilise tout le temps pour réaliser des figures de géométrie un peu difficiles. Mon utilisation réelle de Geogebra :

Yes to everything that has already been mentioned. Additionally, I use some geogebra constructions as well (especially for linear optics, nice interactive demos for images from lenses, and multi-sense-systems)

La Esfenocorona es un poliedro convexo con 12 △ equil. y 2 □, 22 aristas y 10 vértices. De estos, en 2 inciden 2 △ y 2 □, en ese orden; en 4 inciden 3 △ y un □; en los 4 restantes 5 △. Es el sólido de Johnson J86. #GeoGebra ilarrosa.github.io/GeoGebra/Esf... ilarrosa.github.io/GeoGebra

Sure thing! I wrote a blog post just for you which includes links to the STL files.

In-person tickets are selling fast for the MathsJam UK Gathering - join us (in-person or remotely!) for a weekend of recreational maths in a conference centre and meet others who also love maths! Details at www.mathsjam.com/gat...

As well as our monthly pub meetings, there are also bigger annual MathsJam gatherings - one in the UK around November, and one in Oceania (New Zealand) - for details visit https://mathsjam.com/gathering

Tomorrow in Cal: The amazing e^x whose derivative is e^x. @geogebra makes these visuals so easy.

I've been seeing ads for the Shashibo toy. It looked like a more elaborate version of the kaleidocycle, which is fun to make out of paper. Shashibo is a ring of pyramids that comes in the shape of a cube but can be rearranged into a variety of shapes....

Hello @tmip.bsky.social et al. Let me introduce my submission for the April Animation prompt of a 'Polyhedral Net'. I went with the type used for fishing, I hope you enjoy it. #geogebra #mathanimations #mathsky #mathsanimationtmip youtu.be/fCtsAXOo4NU

#PythonGgb : courbe de Gosper, un poil plus alambiquée que la ligne de Hilbert... Défi personnel, mais peu de plus value didactique par rapport aux usages séparés de #python et de @geogebra. En classe, moins de spectaculaire, mais plus de géométrie dynamique ! geogebra.org/python/index...

I made this @geogebra applet that lets you play with Johan Gielis's polar super-formula. You can use it to make interesting shapes like these. https://www.geogebra.org/m/pprqzpja

Xa podemos empezar a desvelar cousiñas... <<¿Hasta dónde podemos llegar con GeoGebra?>> é o título da ponencia coa que nos vai deleitar @bancoche.bsky.social no IV Día GeoGebra de Galicia. #ourense #15febreiro #diageogebragalicia @geogebra.org

Klein Bottle exploration in #GeoGebra #3d calculator with AR: youtube.com/shorts/NDXlX...

Aquesta setmana els problemes del concurs d'@innovamat_cat estan ambientats en #GeoGebra i aprofitem per fer-li una mica d'homenatge a en Pep Bujosa, que va ser el primer que em va presentar el software! Sempre et tindrem present. innovamat.com/contest/ca/con…

I played a bit with llms and physics sketch generation, it's not a well defined benchmark, but out of Model =[gemini, chatgpt, mistral, claude] x OutputFormat=[Undefined, svg, tikz, geogebra], Claude + Geogebra is the current winner. My prompt - without output format, is posted below

Beaded Archimedean Solids!!! I had lots of fun over the past two weeks making these for the pigeonholes at the TMiP conference. [Each n-regular graph has an n-colouring and there's a pair of colours on each one which form a Hamiltonian cycle.] #TMiP25 #MathsArt #MathArt #Polyhedra

Wolfram Alpha is revolutionary

Some people were interested in my 3D brain puzzle 🧠 🖨️, so I added it to Thingiverse for anyone to download and print! I made it a few years ago for my niece so she can learn about the brain. Let me know if you get to use it; I would love to see the results! www.thingiverse.com/thing:7000013

3D print Iwahiro's Apparently Impossible Cube puzzle. (Watch the video to see how it works.) via @mikeandallie http://bit.ly/NZfaTY

The game Dobble/Spot It! has an interpretation within projective geometry. The game with 7 different symbols then corresponds to the Fano-Plane. A model for this can be seen in the picture above, and is also available for you to print yourself: www.thingiverse.com/thing:5210739 #math #geometry

A hyperboloid made from drinking straws. (I wish I had non-bendy straws.) 3D print from https://cults3d.com/en/3d-model/home/math-teachers-pencil-straw-holder-stand-hyperboloid-ruled-surface

The Ninth Stellation of the Dual of the Rhombic Octagonoid robertlovespi.net/2024/10/26/t... This is what my #blog has the most of: rotating .gifs of various #polyhedra I make with #Stella 4d: #Polyhedron Navigator. To see it move, just follow the link.

my polyhedral puzzle printing project (that's a mouthful!) yielded these two guys. These are after Stewart Coffin designs www.johnrausch.com/PuzzlingWorl... Figures 101 and 107, respectively - the second and third stellation of the rhombic dodecahedron.

Finished. #Christmas #origami #mathsky

A break from doomscrolling. #zometool

I’ll accept BlueSky isn’t following the same pattern of benefiting off of users when the year of the Linux desktop comes to fruition.

Holy crap! The New Yorker says my book is one of the best books of 2023 (so far)!!! https://www.newyorker.com/best-books-2023

The FTC has filed a request for an injunction to block Microsoft from closing its Activision Blizzard deal. If the FTC is unsuccessful then Microsoft says it welcomes the opportunity to fast track the FTC case in a federal court. Details:

*Reposting so the picture makes sense. Bluesky are releasing invite codes to control the rate of adoption. This is important because adoption is generally a complex statistic. This allows them to control the initial parameters of the system in it's route to chaos and set the trajectory.

Recovering secret keys from devices using video footage of their power LED (nassiben.com) Main Link | HN Post

hi im nora i make little jewels out of glass in my kiln. please buy them. https://www.nora.jewelry/

This app has unfortunately gotten just big enough that you're starting to get people in the replies who read your posts with the most bad faith interpretation imaginable.

here's my story on Octopus Energy's Agile tariff and how you can get free and much cheaper electricity in the UK right now https://www.theverge.com/23755092/free-electricity-uk-how-to-octopus-energy-agile

Need to find electronics DIY Arduino rpi esp32 microcontroller type people on here, help

One example that I did years before iot was a thing was to measure the temperature in different rooms to determine where heating needs to be activated based off a set of rules (schedule). I just had a relay wired into the thermostats controlled by an Arduino that sent data via zigbee to a server.

Solar and wind produced more electricity than coal in the US over the first half of the year for the first time! https://www.scientificamerican.com/article/in-a-first-wind-and-solar-generated-more-power-than-coal-in-u-s/