Discover and read the best of Twitter Threads about #piday

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Hilos sobre episodios de aula, actividades, secuencias, ideas, didáctica, etc. de geometría.
La mediatriz a través de la resolución de problemas. Aprendizaje por descubrimiento, con andamiaje, claro.
Este hilo comienza con una reflexión sobre las actividades en modo confinamiento y termina con el cálculo de áreas a partir de la construcción del rectángulo equivalente.
Read 7 tweets
Recovery progress. We sail at dawn, bring snacks
Genetics and damage to dna from chemotherapy and sunlight over my lifetime caused scary bad boy to grow inside my eyelid, 5 misdiagnoses, 5 doctors. 2 awesome surgeons did 2 successful surgeries over 2 days last week. No systemic threat. Blessed. Utah. @MoranEyeCenter affiliated.
I’m not recovered from surgery enough to be baking yet but happy #PiDay here are last pies I baked before procedures.
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1/ Happy #PiDay aka Einstein's birthday (see below).

Serendipitously, we watched IQ (1994) last night…

I have mixed feelings about the film. On one side, I saw it being made as a junior, so that was cool.

2/ OTOH, there were 3 major movie sins:
(1) the writers turned the most famous Jewish refugee from N*zi Germany into an uncle of a blond WASP

(2) IRL, Einstein didn't treat women very well at all, yet the movie makes him a romantic softie.…
3/ More subtly (3) the writers have Einstein validate the standard American-Hollywood anti-intellectual creed that blue-collar mechanics are 'real' & 'authentic' while intellectuals aren't.

I do accept their depiction of 1950s social science.…
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Actividad en 2º ESO: mide el área del mantel (amarillo) tomando como unidad la servilleta (naranja). No te creerás lo que pasó a continuación.
Hilo sobre medida en el Día Internacional de las Matemáticas #idm314 Image
Efectivamente, hay alumnos que sacan una regla, miden el largo y ancho del mantel, multiplican y te dicen que el área mide no sé cuántos centímetros cuadrados.
- No, tomando esto (la servilleta) como unidad.
- ¿Ein? [Insert aquí cara de «pero qué me estás contando»]
También los hay que miden el perímetro con la regla y te dicen que el área mide tantos centímetros. Ojo, que estamos hablando de alumnado de 13-14 años de edad.
Read 54 tweets
35.01/ Week thirty-five, March 13-19 2021, begins here. Last week's thread is below.
35.02/ An accurate thread of Ashkenazi culture on #Passover. [Hint: we rabbis haven't forbade potatoes yet. But don't provoke us]
35.03/ Thread about #PiDay, Albert Einstein and the movie IQ. Because, of course
Read 51 tweets
#πDAY #PiDay

எழுதியவர் : Ladchumanan Lavan

இன்று பை (Pi/π) தினம். Pi ஐ கூட யாரவது தமிழ்ப்படுத்தி இருக்கக்கூடும். சிறு வயதில்
Pi(π) = 22/7 என்றும், கொஞ்சம் விளக்கமாக ஒரு வட்டத்தின் பரிதிக்கும் விட்டத்துக்கும் இடைப்படட விகிதம் என்றும் கேள்விப்பட்டிருப்போம். Image
தெரிந்தோ தெரியாமலோ இந்த pi(π) நமக்கு கடைசி வரை பின் தொடர்ந்து தொல்லை கொடுத்து இருக்கும். ஆனால் இந்த Pi(π) கணிதத்தின் ஒரு அழகான காதலி. pi(π) இன்றி அமையாது பாதிக்கணிதம்.
கி.மு. 250ல் இருந்தே இந்த விகிதம் பயன்பாட்டில் இருந்து இருக்கிறது. ஆனாலும் கி.மு. 2ஆம் நூற்றாண்டில் ஆக்கிமிடிஸினால் தெளிவாக வரையறுக்கப்பட்டது. இதனால் ஆக்கிமிடிஸின் மாறிலி என Piக்கு பெயர் வந்தது. ஆக்கிமிடிஸ் முதல் ஆரியப்பட்டா வரை Pi இன் பெறுமானத்தை வரையறுத்துக்கொண்டே வந்துள்ளனர்.
Read 9 tweets
¡¡Feliz Día de Pi 2021!! ¡¡Feliz Día internacional de las matemáticas 2021!!

Hoy 14 de marzo, 3-14 en notación USA, es el mejor día para mostrar la belleza del número Pi. Por ello, durante el día de hoy os iré dejando curiosidades sobre él en este hilo #DíadePi #PiDay #PiDay2021
Y la primera va a ser la que he publicado hace un rato. Se sabe que Pi no es construible con regla y compás, pero sí hay construcciones aproximadas muy interesante, como el llamado método de Kochanski. ¿Lo conoces? Mira, mira #DíadePi #PiDay #PiDay2021…
Seguro que todos recordáis que Pi aparece en la fórmula para calcular el área de un círculo: A=π·r². Ahora, ¿habéis visto alguna demostración de ese hecho? Aquí tenéis una "sin palabras" muy bonita… #DíadePi #PiDay #PiDay2021
Read 35 tweets
Hoy es el #PiDay

El número pi es igual a la longitud de su circunferencia entre su diametro: Π = L/D. Podemos encontrar una aproximación con cualquier objeto redondo. 
No importa lo grande o pequeña que sea la circunferencia, pi siempre es el mismo y por eso es una constante.
Se encuadra dentro de los llamados número irracionales ya que su expresión decimal es infinita y no puede expresarse como el cociente exacto de dos números enteros.Arquímedes fue uno de los primeros en aproximarse al valor del número pi.  #PiDay  #PiDay2021
Como símbolo del número pi se emplea la letra griega π (la decimosexta letra del alfabeto griego). William Jones (1675-1749) introdujo el símbolo para Pi en 1706, y más tarde fue popularizado por Leonhard Euler (1707-1783) en 1737. #PiDay2021
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okay I did the tortilla trend to make a pared down @tacobell breakfast crunchwrap (verdict? it’s...fine?)

•mashed avo w/ lime, salt, pepper
•scrambled eggs with pickled jalapeños
•chipotle sour cream, crispy hash browns
•muenster & bacon #humblebragdiet
I’m bad at making ice cream cuz I approach it like cooking (I build flavors then suss things out) when it’s closer to baking (ingredient ratios can be tweaked but only slightly)

anyway, these will be a boozy dupe for grape flinstones push pops with calpico& soju #humblebragdiet
#humblebragdiet x #unsnackable in purple for my pre-birthday

•homemade boozy flinstones grape push pops (calpico concentrate, grape fanta, yogurt soju)
•luxurious kyoho grape calpis soda (from japan) Image
Read 63 tweets
Feliz 2️⃣0️⃣2️⃣1️⃣, ¡un año brillante!
Árbol de capicúas por @merlinmundo
2 de enero
Hoy es el primer día primo del año 🥳 #hoyesespecial
¿Sabías que has vivido un día especial y tú sin saberlo? #3Enero
#hoyesespecial #matematicas
Read 87 tweets
This weeks highlights #ICYMI: @SharmadhaS presented her and @PrakharMisra’s paper ( on #fiscal modernisation at the @Igidr_Mumbai Seminar. Check out some key takeaways from their paper here: (1/3) Image
On solutions for India’s #housing conundrum: @nebuer42 and @pritika13 write on the need for liberalising #FSI (, while @VaidehiTandel, @IsalyneGe and Mehul Das make the case for better land-use policies. ( (2/3)
Finally, some cool #threads, one on #bureaucrats in fiction by Sneha Menon ( and this one on 𝛑 ( by our in-house #PiDay enthusiast, @priveda22 (3/3)
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To celebrate #PiDay, my housemate and I created thoroughly scientific ratings of different pie emojis on Emojipedia. 🥧 Here we go:
Apple: This Apple pie had better be an apple pie, and everyone likes apple pie. Seems basic, but a solid foundation. The subtle steam is a nice touch. 8/10. Pie emoji from Apple
Google: Pumpkin is a rather divisive choice, and #PiDay isn't even during pumpkin spice season. The crust looks a little cardboard-y, but the whipped cream looks delicious. 6/10. Pie emoji from Google
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Ok! I’ve been asked by @johndavidian to do a #PiDay tweet-storm on Key Lime pie and how it thickens without cooking! Strap in, #FoodSci ahead! Heads up, I'm about to disagree with Wikipedia… 1/29
Here’s a recipe. Something fun about key lime pie is that it’s kinda new, as the history of pie goes - it’s missing from my collection of midcentury cookbooks (this is Doubleday) 2/29 Image
The interesting thing about the recipe is that we are not using heat to set the filling. This is no-cook. YET we add 3 liquids together to make the filling (four if you count the food coloring). What? 3/29
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#PiDay is celebrated on March 14th since it resembles 3.14. Pi (𝛑) is the ratio of the circumference of a circle to its diameter. It also happens to be Albert Einstein’s birthday. Fun facts #thread about #pi (1/ 5) Image
Last year, Emma Haruka from @Google calculated 31,415,926,535,897 digits (most calculated so far) of Pi using program called y-cruncher using 25 Google Cloud virtual machines over four-months (2/ 5)
Pi Day was first celebrated by physicist Larry Shaw at San Francisco's Exploratorium, where he is known as the "Prince of Pi”(3/ 5) Image
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Hoy es el #PiDay El número pi es igual a la longitud de su circunferencia entre su diametro: Π = L/D. Podemos encontrar una aproximación con cualquier objeto redondo.
No importa lo grande o pequeña que sea la circunferencia, pi siempre es el mismo y por eso es una constante. Image
Se encuadra dentro de los llamados número irracionales ya que su expresión decimal es infinita con secuencias de números que nunca se repiten. Arquímedes fue uno de los primeros en aproximarse al valor del número pi. #PiDay #PiDay2020 Image
Como símbolo del número pi se emplea la letra griega pi (la decimosexta letra del alfabeto griego). Fue utilizado inicialmente por William Jones en 1706 y popularizado posteriormente por el gran matemático y físico Leonhard Euler, hacia 1734, que fue el primero en saber su valor Image
Read 11 tweets
1/1² + 1/2² + 1/3² + ... = π²/6
~ a fluid dynamics proof ~

The complex function
f(z) = cot(πz)/2z²
gives rise to a fluid flow such that the conservation of mass yields the solution of the Basel problem.
YouTube link


Read 5 tweets
With Pi Day just around the corner, let’s remember what Pi is all about.

After washing your hands thoroughly, cut the crust off a pizza pie and lay it across four others. You’ll see that the crust spans a little more than 3 pies. That’s Pi ≈ 3.14.

But that’s not all! (Cont’d)
2/ Remember that

Area = Pi r^2

formula for a circle? That’s not really the formula. It should be:

Area = radius x (half circumference),

where circumf=Pi*diameter, so half of that is Pi*radius.

Proof: cut your pizza into small slices and arrange into an r x (C/2) rectangle...
3/ Plenty more fun to be had, and will be had at @MoMath1’s pre-Pi Day Family Friday, a week from today. Register here:…

Q: What’s the volume of a cylinder with height a and radius z?

A: Pi z z a!

(With thanks to the @RutgersU math grad student seminar!)
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The new year begins and I usher into a scientific journey where I shall be challenging myself with scientific quest and reviewing a scientific article/blog/interview/technique or facts on a daily basis. (or at least try😉) #365DaysOfScience
Let the journey begin.
The most cited article (over 300,000 times) is the @jbiolchem paper for a technique to estimate protein concentration in a solution. The paper is "Protein measurement with the folin phenol reagent".
Image: @nature Image
Yes, the classic Lowry's method was published in May 1951. This is a colourimetric assay which gives an estimation of the amount of protein based on a standard curve obtained from a protein of known concentration (usually BSA).
Read 833 tweets
I pulled up some numbers for Google Cloud Platform server and storage pricing to see how much it would cost a layperson to do the 31.4 trillion Pi calc.

I didn't look into network costs, or extra time for configs/restart - just raw computation time. I get a price of $173,335.76
This is using standard pricing, not pre-emptible pricing, which is a lot cheaper.

Here's the URL for GCP costs:
Here's some costs on hardware, at just over $200k. This is raw list pricing - Google and other cloud providers obviously buy this stuff at super cheap pricing. This is ballparking, based on the loose specifications cloud providers give for instances and configurations.

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For #PiDay + #WomensHistoryMonth, I honor an eminent, glass-ceiling-breaking mathematician, Dr. Loretta Marion Murray Braxton. In the 1950’s, her 1st math prof in college in VA told her that she was in the wrong classes, b/c "only boys took higher-level math classes."1/14
Undeterred, Loretta Braxton won an NSF to do an MS in math in a top program at the University of Illinois, obtained a doctorate, and taught the 1st African American who formed a billion-dollar company, Reginald Lewis. #PiDay #Fearless 2/N
As a math teacher, professor, and 15 years as chair of the math department at @VSUTrojans, Loretta Braxton mentored several generations of math students, many of whom became teachers + college or university professors themselves. #BlackAndSTEM 3/14
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#PiDay thread:

3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593344612847564823378678316527120190914... (1/∞)
564856692346034861045432664821339360726024914127372458700660631558817488152092096282925409171536436789259036001133053054882046652138414695194151160943305727036575959195309218611738193261179310511854807446237996274956735188575272489122793818301194912983367336244065664308... (2/∞)
602139494639522473719070217986094370277053921717629317675238467481846766940513200056812714526356082778577134275778960917363717872146844090122495343014654958537105079227968925892354201995611212902196086403441815981362977477130996051870721134999999837297804995105973173281... (3/∞)
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It’s #PiDay… but it’s also #worldkidneyday! Critically important issue to me personally and so many Americans. 1/8
Many people with #chronickidneydisease don’t know it and it is major and rising cause of morbidity and mortality in the US and globally – we must do better! #heartyourkidneys #worldkidneyday 2/8
Today is also great opportunity to pay tribute to all of those courageous and generous people who have donated kidneys. Living donors should be better supported and we are working to make this happen. #worldkidneyday 3/8
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One of the many great things about Pi is that it's algorithmically compressible. You can express the idea of Pi using far fewer characters than are actually contained in its numerical expression (which would be an infinite number). #PiDay 1/
Between 0 and 10 (say), there are an infinite number of rational numbers: those expressible as p/q, where both p and q are integers. The rationals are "dense" - given any number between 0 and 10, there is a rational number arbitrarily close to it. 2/
But there are infinitely more irrational numbers, those that can't be expressed as p/q. It's a bigger infinity than the number of rationals. The rationals are "countable," the irrationals are "uncountable." There are a lot of irrational numbers out there. 3/
Read 7 tweets

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