Math & animations with GeoGebra 🇫🇷 • Once a teacher... • Author w/@edsouthall of #GeometrySnacks (and More G.S.) • #mathGIF • https://xitter.cf/t.co/usdr3TAM1P
France
Joined January 2010
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Hey ! I got an idea. Can you guess what that representation is ?
Hint : 🎲 & 🔺
Move it in 3D around here (spoiler 🇫🇷) : geogebra.org/m/yrw7n9ns
Vincent Pantal🍩ni retweeted
Nice! I think this is even better to see y=sqrt(x) !
Explain why for every even integer n, sqrt(n) can be read at the intersection of two semi-circles.
Vincent Pantal🍩ni retweeted
Like an hour ago, my kids decided they were mathematicians and began a series of investigations (on their own).
1+2+⋯+10=55
11+12+⋯+20=155
21+22+⋯+30=255
etc.
They conjectured the general theorem. Pretty exciting.
#SundayPuzzle.
A red right-angled triangle and its incircle. Prove that the blue rectangle has the same area than the red triangle.
#GeometrySnacks
A nice proof without words of the Pythagorean Theorem by Abu' l'Hasan Thâbit ibn Qurra Marwân al'Harrani (826-901) with 6 congruent 📐.
The total area 𝓐 can be seen in two ways :
1⃣ 𝓐=🟥+ 3 📐
2⃣ 𝓐=🟩+🟦+3📐
So 🟥=🟩+🟦
@CutTheKnotMath proof #24
cut-the-knot.org/pythagoras/
Vincent Pantal🍩ni retweeted
5-stars were commonly used on the ceilings of tombs and other buildings in Ancient Egypt to depict the heavens. They are usually not connected to one another, but they are connected in this ceiling in the Ptolemaic Denderah Temple to form a sort of tessellation.
#Puzzle 📐Prove that the yellow right triangle, the pink rectangle and the cyan square all have the same area.
#GeometrySnacks
Vincent Pantal🍩ni retweeted
Today's Puzzle:
Every odd number is the difference of two squares.
Which even numbers are the difference of two squares?
Vincent Pantal🍩ni retweeted
1000 candies on a table each considered a pile of size 1.
A "move" consists of taking three piles of the same size, eating one of them and combining the other two to make a bigger pile.
What is the largest number of moves you could possibly conduct?
Vincent Pantal🍩ni retweeted
My "Math, Revealed" series is freely available to anyone -- no paywall! -- in the thread below
Vincent Pantal🍩ni retweeted
@stevenstrogatz continues his amazing math series in the NYT - a simply terrific blend of great writing, incredible graphics, and compelling mathematics. nytimes.com/interactive/2025…
Vincent Pantal🍩ni retweeted
100 mph going forward. 50 mph going back. Why average speed IS NOT 75 mph: youtube.com/shorts/UHBjfiB-1… #MTBoS #ITeachMath
Two squares share a side. Two congruent isosceles triangles.
Prove that the three red points are indeed collinear.
#GeometrySnacks
Several solutions in this @GeoGebra book.
📖🔗geogebra.org/m/xtxahrrm#chap…
Solutions by : @RonySarker71 , @vasca0000 , @HarishMamania , @guillou25 , @AmareshGS1 , @genkuroki , @WayneJBurrows.
A regular hexagon and a square.
What fraction of the area of the square does the red kite represent ? #WFIS #GeometrySnacks
Vincent Pantal🍩ni retweeted
Nice and useful. Worth taking note of.
How to read a, b, c on the parabola y=ax²+bx+c.
#quadratic #parabola
@GeoGebra:geogebra.org/m/npsetue8
