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OK, here’s a counterexample with mostly nice numbers.

It wasn’t easy to find because when all numbers are ‘nice’ then the proposed theorem usually holds true 😆 e.g. rhombus, parallelogram, etc.

#geometry #iTeachMath #puzzle #quadrilateral #midpoint #geogebra
#geometry #iTeachMath #puzzle #quadrilateral #midpoint #geogebra

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🕷️ 🌚

#spider #point #transalation #distance #scrolling #fun #geogebra #segment

Menger’s sponge walk .

#loop #fractal #menger #sierpinski #fun #geogebra

A "big" one :

#geogebra : www.geogebra.org/m/tzmjrbqz
#truchet #mathart #geometry #symetries #reflexion

Un pavage de Truchet modifiable en cliquant sur les triangles d'une zone bien précise.
geogebra.org/m/pngnrsgh

#truchet #geogebra #geometry #mathart #triangle

Truchetterie avec #pyggb
"Triangles and nothing else" from the past.
#geogebra #python #math #triangle
#truchet #genuary #genuary13

geogebra.org/m/mqh6xkdy

New section: Conformal mapping

complex-analysis.com/content/c…

#geogebra #opensource #mathematics

Trucheterie

#tile #truchet #tiling
#geogebra :geogebra.org/m/bddj5exr

Open source software costs nothing, but enables people to do great things with it. This is the #opensource software/data I've been using to create maps, process images, make animations etc. related to #NASA's #Mars2020 mission:

#GIMP : gimp.org
#Geogebra : geogebra.org
#ImageMagick : imagemagick.org
#QGIS : https : qgis.org
#Stellarium : stellarium.org

@kevinmgill's and @stim3on's flats: github.com/kmgill/mars-raw-uti…

1/

GIMP

GIMP - The GNU Image Manipulation Program: The Free and Open Source Image Editor

^GIMP

Open source software costs nothing, but enables people to do great things with it. This is the #opensource software/data I've been using to create maps, process images, make animations etc. related to #NASA's #Mars2020 mission:

#GIMP : gimp.org
#Geogebra : geogebra.org
#ImageMagick : imagemagick.org
#QGIS : https : qgis.org
#Stellarium : stellarium.org

@kevinmgill's and @stim3on's flats: github.com/kmgill/mars-raw-uti…

1/

GIMP

GIMP - The GNU Image Manipulation Program: The Free and Open Source Image Editor

^GIMP